Article
Thermodynamics
Shangwen Gao, Suchen Wu, Raza Gulfam, Zilong Deng, Yongping Chen
Summary: In this study, a self-similar fractal groove superhydrophobic surface was designed and fabricated, and its droplet dynamics and heat transfer performance were investigated. The results showed that the fractal grooves can promote droplet jumping at low subcooling and facilitate condensate removal at high subcooling.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Ting-en Huang, Junghoon Lee, Chang-Hwan Choi, Peng Zhang
Summary: The condensation heat transfer performance of lubricant-impregnated surfaces is improved due to the increased mobility of droplets and self-healing characteristics. The study fabricated a lubricant-impregnated surface using Teflon-coated anodized nanoporous oxide layer on stainless steel infused with Krytox GPL103 oil. Compared to Teflon-coated stainless-steel surface (T-S) and Teflon-coated anodized stainless-steel surface (T-AS), the lubricant-impregnated Teflon-coated anodized stainless-steel surface (L-T-AS) showed shedding of discrete droplets and their sweeping without coalescence, resulting in a heat transfer coefficient 398.4% higher than T-AS at low subcooling temperature. Theoretical models considering the density distribution function of droplets further elucidate the heat transfer performance of L-T-AS in dropwise condensation.
SURFACES AND INTERFACES
(2023)
Article
Multidisciplinary Sciences
Muhammad Jahidul Hoque, Longnan Li, Jingcheng Ma, Hyeongyun Cha, Soumyadip Sett, Xiao Yan, Kazi Fazle Rabbi, Jin Yao Ho, Siavash Khodakarami, Jason Suwala, Wentao Yang, Omid Mohammadmoradi, Gozde Ozaydin Ince, Nenad Miljkovic
Summary: Hydrophobic condenser surfaces enhance power plant efficiency but lack durability. The authors developed a durable fluorinated diamond-like carbon coating that maintained hydrophobicity and improved dropwise condensation over three years of steam condensation. This solution could increase global electricity generation and reduce CO2 emissions. The solid F-DLC coating exhibits mechanical and thermal properties that ensure durability without relying on other strategies. The findings provide a promising solution to the fragility of hydrophobic materials and can enhance energy sustainability.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Jingcheng Ma, Laura E. Porath, Md Farhadul Haque, Soumyadip Sett, Kazi Fazle Rabbi, SungWoo Nam, Nenad Miljkovic, Christopher M. Evans
Summary: By utilizing polydimethylsiloxane vitrimers, nanoscale-thick, perfluorinated compound-free durable hydrophobicity can be achieved, with weather resistance and self-healing capabilities. This thin film maintains excellent hydrophobicity and transparency even after scratching, cutting, and indenting, and can be deposited on various substrates through scalable dip-coating processes.
NATURE COMMUNICATIONS
(2021)
Article
Thermodynamics
Fengyong Lv, Sifan Lin, Jie Miao, Cong Wang, Zhenbiao Dong, Raza Gulfam
Summary: This study developed slippery lubricant-infused porous surfaces (SLIPSs) on helically-finned grooves of copper tubes (HF-SLIPSs). The high viscosity lubricant (GPL 107) was locked by the nano-pores of the oxidized layer on the grooves. The results show that HF-SLIPSs not only improve droplet mobility and increase condensing area but also provide directional transport tracks, resulting in a short renewal time and enhanced condensation heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Multidisciplinary
Abinash Tripathy, Cheuk Wing Edmond Lam, Diana Davila, Matteo Donati, Athanasios Milionis, Chander Shekhar Sharma, Dimos Poulikakos
Summary: Researchers have developed an ultrathin and conductive lubricant-infused surface architecture that greatly enhances heat transfer performance while resisting lubricant depletion, making it perform better in condensation processes.
Article
Thermodynamics
Milad Shakeri Bonab, Roger Kempers, Alidad Amirfazli
Summary: This study investigated the influence of airflow on the condensation heat transfer coefficient of humid air on a horizontal surface. The results showed that the heat transfer coefficient was lowest for a subcooling temperature of 0 degrees C, and higher relative humidity resulted in higher heat transfer coefficients.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
Tibin M. Thomas, Pallab Sinha Mahapatra
Summary: The study introduces a novel plate-type condenser platform that can passively remove condensate from a horizontally oriented surface without gravity by using patterned wettabilities. The proposed condenser design shows improved condensation heat transfer performance and can be used for temperature and humidity management applications in space.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Jianxing Sun, Xinyu Jiang, Patricia B. Weisensee
Summary: Lubricant-infused surfaces enhance dropwise condensation and heat transfer rates by creating distinct oil-rich and oil-poor regions for water microdroplets to self-propel, but the dynamic interplay between oil film redistribution, droplet self-propulsion, and nucleation process is not fully understood.
Article
Chemistry, Multidisciplinary
Bingang Du, Yaqi Cheng, Siyan Yang, Wei Xu, Zhong Lan, Rongfu Wen, Xuehu Ma
Summary: This study explores the importance of controlling vapor nucleation on micro-/nanostructured surfaces and the surface morphology to achieve this. The research found that nanostep morphologies around the top of nanowire bunches can reduce energy barriers and enhance nucleation, thus promoting vapor nucleation and droplet removal.
Article
Thermodynamics
Zhifeng Hu, Zhiping Yuan, Huimin Hou, Fuqiang Chu, X. M. Wu
Summary: An event-driven simulation method is proposed to efficiently simulate multi-scale three-dimensional dropwise condensation, significantly improving computational efficiency. The influence of droplet departure modes on dropwise condensation is discussed, showing the importance of droplet jumping in enhancing condensation heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Nanoscience & Nanotechnology
Yu Tang, Xiaolong Yang, Ligeng Wang, Yimin Li, Di Zhu
Summary: A dropwise condensate comb with U-shaped protruding hydrophilic stripes and hierarchical micro-nanostructured superhydrophobic background was introduced to control the size and departure processes of condensation droplets. The experiment showed that the heat transfer coefficient and heat flux could be significantly enhanced by spatial control of condensation droplet size and departure processes. This work has the potential to transform the design and fabrication space for high-performance heat transfer devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Anthony Katselas, Isaac J. Gresham, Andrew R. J. Nelson, Chiara Neto
Summary: The capture of moisture from the atmosphere through condensation has the potential to provide a sustainable source of water. This study investigates how water contact angle and contact angle hysteresis affect the rates of water capture during condensation of humid air at low subcooling conditions. The results show that hydrophilic and slippery hydrophilic surfaces are preferable for efficient dew collection applications.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Dong Niu, Hongtao Gao, Guihua Tang, Yuying Yan
Summary: In this study, molecular dynamics simulation was used to investigate droplet nucleation and growth in the Ar-Ne mixed system. Different droplet state transition modes were identified, and the interaction between NCG and droplets was considered to explain the wetting state. The disappearance mechanism of the flooding mode on nanostructured surfaces under large amounts of NCG was clarified at the nanoscale, providing insights into the NCG effect on dropwise condensation heat transfer on nanostructured superhydrophobic surfaces.
Article
Thermodynamics
Taeseok Kim, Doyoung Shin, Jaemin Lee, Sung Joong Kim
Summary: The study found that layer-by-layer assembled carbon nanotube coatings can enhance dropwise condensation heat transfer under steam-air mixture conditions, with further improvement in condensation heat transfer coefficient by adding a hydrophobic coating. A new HTC model incorporating constriction resistance was developed to better predict the measured condensation HTC.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Energy & Fuels
Zhonghui Shen, Lei Zhou, Honglian Li, Zhaohui Lu, Jianchao Cai
Article
Energy & Fuels
Junqian Li, Shuangfang Lu, Pengfei Zhang, Jianchao Cai, Wenbiao Li, Siyuan Wang, Wenjun Feng
Article
Energy & Fuels
Jianchao Cai, Caoxiong Li, Kaoping Song, Shuangmei Zou, Zhengming Yang, Yinghao Shen, Qingbang Meng, Yang Liu
Article
Energy & Fuels
Lele Liu, Zhun Zhang, Chengfeng Li, Fulong Ning, Changling Liu, Nengyou Wu, Jianchao Cai
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2020)
Article
Chemistry, Physical
Junfeng Xiao, Xiang Liu, Youming Luo, Jianchao Cai, Jianfeng Xu
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Mathematics, Interdisciplinary Applications
Guannan Liu, Boming Yu, Dayu Ye, Feng Gao, Jishan Liu
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2020)
Article
Geosciences, Multidisciplinary
Jianchao Cai, Yuxuan Xia, Cheng Lu, Hang Bian, Shuangmei Zou
MARINE AND PETROLEUM GEOLOGY
(2020)
Article
Engineering, Chemical
Yang Liu, Jianchao Cai, Muhammad Sahimi, Chaozhong Qin
TRANSPORT IN POROUS MEDIA
(2020)
Article
Thermodynamics
Xuan Qin, Jianchao Cai, Yingfang Zhou, Zhiqin Kang
APPLIED THERMAL ENGINEERING
(2020)
Article
Mechanics
Yang Liu, Shuangmei Zou, Ying He, Shuyu Sun, Yang Ju, Qingbang Meng, Jianchao Cai
Summary: In this study, an optimized color-gradient lattice Boltzmann model was applied to simulate steady-state two-phase flow in two-dimensional porous media with different rough surface conditions. It was found that surface roughness negatively affects both single-phase and two-phase fluid flow, with absolute and relative permeabilities decreasing with increasing roughness height or surface fractal dimension. This study provides valuable insights into the impact of surface roughness on two-phase flow behavior at a pore scale, which is essential for understanding macroscopic multiphase flow behaviors.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2021)
Article
Thermodynamics
Shabbir Ahmad, Jianchao Cai, Kashif Ali
Summary: This research aims to understand the effect of a magnetic field generated by a nearby dipole on the flow of nanofluid in a cavity. The study shows that the dipole can create new vortices in its vicinity and enhance the Nusselt number. The Reynolds number reduces the Nusselt number along the lower wall and affects the strength of vortices near the dipole location. Increasing the strength of the dipole distorts the symmetry of streamlines and shifts the zone of higher temperature gradient.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Geochemistry & Geophysics
Yingfang Zhou, Dimitrios Georgios Hatzignatiou, Johan Olav Helland, Yulong Zhao, Jianchao Cai
Summary: In this study, a semianalytical model was developed to compute three-phase capillary pressure curves and fluid configurations for gas invasion in uniformly wet rock images. The model was validated and applied to an SEM image, showing similar fluid configurations as previously observed.
Article
Chemistry, Multidisciplinary
Peng Qiao, Yiwen Ju, Jianchao Cai, Jun Zhao, Hongjian Zhu, Kun Yu, Yu Qi, Shangzhi Meng, Wuyang Li, Ying Sun, Cheng Huang, Hongye Feng
Summary: Quantitative characterization of the micro-nanopore structure of tight sandstone reservoirs is crucial for understanding gas accumulation and distribution. Through a combination of various experiments, it was found that dissolution pores with diameters less than 8 µm are the main contributors to gas storage space in tight sandstone reservoirs, with a pore size distribution concentrated in the range of 247-371 nm. The fractal characteristics of the sandstones, including nanopore fractal dimension and large pore fractal dimension, are positively correlated with porosity and negatively correlated with permeability.
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
(2021)
Review
Energy & Fuels
Zhun Zhang, Lele Liu, Chengfeng Li, Jianchao Cai, Fulong Ning, Qingguo Meng, Changling Liu
Summary: This study derived a fractal model to show the physical connections between saturation exponent and pore structure parameters, extracted pore structure parameters related to hydrate saturation for validation, and discussed the effects of various factors on saturation exponent values in Archie's law.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Bingke Li, Xin Nie, Jianchao Cai, Xueqing Zhou, Chenchen Wang, Denglin Han
Summary: This paper presents a method to accurately and quickly establish digital core images with multi-mineral components. By training a U-Net model, the CT images are automatically segmented and converted into multi-mineral component images, and manually segmented micropores and fractures are added. The results are satisfactory.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
