Review
Thermodynamics
Raj Patel, Michael Meyer, Jason Hartwig, Issam Mudawar
Summary: Despite the lack of a reliable cryogenic pool boiling CHF database, this study compiles a new consolidated database and develops new powerful tools for designing cryogenic space systems based on the assessment of previous models and correlations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Vishwanath Ganesan, Raj Patel, Jason Hartwig, Issam Mudawar
Summary: In this study, a comprehensive database is developed by mining data from global literature to investigate the film boiling heat transfer coefficient (HTC) of cryogens. New universal cryogen correlations are constructed based on the database, providing a research foundation for cryogenic film boiling heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Yiwu Kuang, Fei Han, Lijie Sun, Rui Zhuan, Wen Wang
Summary: This study constructed a database of liquid hydrogen flow boiling heat transfer, utilized an Artificial Neural Network to identify key parameters, and proposed a new correlation for predicting the Nusselt number of liquid hydrogen flow boiling, achieving accurate predictions.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Keerthi Raj Kunniyoor, Parthasarathi Ghosh
Summary: There is currently considerable interest in developing constitutive relations for accurate heat transfer prediction during cryogenic feed line chill-down. In this study, a new database is developed for transient quench flow film boiling using data from various chill-down experiments. The collected data is used to analyze existing film boiling correlations and propose new ones that have good agreement with experimental results. These new correlations can be used to support the design of reliable and energy-efficient cryogenic fluid transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Junlong Li, Chaozhu Zhang, Qi Zhang, Ping Yang, Fujun Gan, Shuo Chen, Zhenqin Xiong, Yao Xiao, Hanyang Gu
Summary: This article presents a flow boiling heat transfer experiment conducted in a vertical rod bundle and investigates the effects of parameters on wall superheating degree and heat transfer coefficient. New correlations are proposed to predict the experimental data.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Gen Li, Xiande Fang, Da Tang, Zufen Luo, Yafeng Chen
Summary: Experiments on R1234yf flow boiling under hypergravity conditions show that the heat transfer coefficients (HTCs) increase with increasing gravity levels up to a certain quality, but the effects of gravity become indistinct at high quality levels. The trends of HTC variation with quality and the effects of heat flux, mass flux, and saturation pressure on HTC are similar under different gravity levels.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Thermodynamics
Weijie Zeng, Bo Gu, Zhongxing Du, Xucheng Liu, Zhen Tian
Summary: The objective of this study is to establish generalized correlations for R32 flow boiling heat transfer and frictional pressure drop in horizontal channels with wide ranges of geometric and flow parameters. New correlations were developed based on consolidated databases, providing superior prediction accuracy for heat transfer and pressure drop performance analysis. Validation results showed improved accuracy compared to existing empirical correlations.
INTERNATIONAL JOURNAL OF REFRIGERATION
(2021)
Article
Nanoscience & Nanotechnology
Junsheng Hou, Junjie Wu, Hongqiang Chen, Lei Huang, Li Ma, Xiong Zhao, Zihan Ding, Yonghai Zhang, Jiabin Fang, Jinjia Wei, Satoshi Watanabe, Nanjing Hao
Summary: A facile microfluidic synthesis strategy is developed to prepare highly stable and size-controllable silica nanofluids, enhancing the heat transfer efficiency and providing new insights for the rational design of two-phase cooling nano-systems.
MATERIALS TODAY NANO
(2023)
Article
Thermodynamics
Jaco Dirker, Hannalie Scheepers, Josua P. Meyer
Summary: This article investigates the heat transfer characteristics of saturated flow boiling under non-uniform heat flux conditions. Experimental tests show that non-uniform heat flux conditions significantly reduce the average heat transfer coefficient, highlighting the need for further research on heat flux distribution.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Utkarsh Deep Tiwari, Parmod Kumar
Summary: This study investigates the film boiling heat transfer phenomenon for elliptical heaters arranged in a tandem and subjected to cross-flow of saturated liquid at near critical pressure conditions. The effects of vertical spacing, aspect ratio, degree of wall superheat, and Reynolds number are studied on bubble departure dynamics and heat transfer characteristics. It is found that the bubble departure size from the bottom heater remains almost unchanged, but the departure frequency increases with higher Reynolds number and degree of superheat. The bubble size and departure frequency of the top elliptical heater vary significantly with aspect ratio, pitch, Reynolds number, and degree of superheat. The time-averaged heat transfer coefficient increases with increasing pitch distance, aspect ratio, Reynolds number, and degree of superheat, but the rate of increase diminishes at high degree of superheat.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Dawen Zhong, Xuexin Lian, Haopeng Shi, Junfeng Zhang, Ji 'an Meng, Jingyu Zhang
Summary: In-vessel retention (IVR) technology is an effective strategy to retain molten materials in the reactor pressure vessel (RPV) during severe accidents in nuclear power plants. A novel type of reticular hollow shell structure (RHS) was designed to enhance the critical heat flux (CHF) of external reactor vessel cooling (ERVC). Experimental results showed that the CHF was significantly increased on all RHS surfaces compared to the plain surface, and surface 1 and surface 3 exhibited better boiling heat transfer performance.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Vishwanath Ganesan, Raj Patel, Jason Hartwig, Issam Mudawar
Summary: Experimental critical heat flux (CHF) data for cryogen flow in round tubes have been consolidated from world literature dating back to 1959, resulting in the largest cryogen CHF database assembled to date. New universal CHF correlations are developed for two distinct CHF mechanisms based on careful physics-based segregation of the data, showing good predictive agreement with the database.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Energy & Fuels
Mohamed Elfaham, Clement C. Tang
Summary: This study comprehensively reviews the two-phase flow boiling heat transfer coefficient of hydrocarbons, such as propane, butane, iso-butane, and ethanol, under various experimental conditions. Investigating the heat transfer coefficient of multiphase flows is crucial for achieving higher efficiency, compact design, and cost reduction in heat transfer equipment. Hydrocarbons are chosen as refrigerants due to their zero ozone depletion potential (ODP = 0) and low direct global warming potential (GWP = 3), as well as their thermodynamic and thermophysical characteristics, which make them strong candidates for various heat transfer applications.
Article
Thermodynamics
Rishi L. Ramakrishnan, Prasanna Jayaramu, Sateesh Gedupudi, Sarit K. Das
Summary: This study experimentally investigated the effect of copper surface ageing on heat transfer and critical heat flux during flow boiling. The results showed that ageing significantly reduces the heat transfer coefficient on the copper surface, while having an insignificant impact on the critical heat flux. Surface morphology and wettability of copper were found to change after ageing.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Jiaqi Tang, Yi Liu, Baoling Huang, Dongyan Xu
Summary: Enhancing flow boiling heat transfer in microchannels can effectively be achieved by adding expansion areas, leading to improved heat transfer coefficients and reduced temperature fluctuations.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Lucas E. O'Neill, Ilchung Park, Chirag R. Kharangate, V. S. Devandhanush, V. Ganesan, Issam Mudawar
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
Naveen Kumar, G. Vishwanath, Anurag Gupta
Article
Green & Sustainable Science & Technology
Naveen Kumar, G. Vishwanath, Anurag Gupta
JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY
(2012)
Article
Green & Sustainable Science & Technology
Naveen Kumar, G. Vishwanath, Anurag Gupta
Article
Thermodynamics
Vishwanath Ganesan, Raj Patel, Jason Hartwig, Issam Mudawar
Summary: Experimental critical heat flux (CHF) data for cryogen flow in round tubes have been consolidated from world literature dating back to 1959, resulting in the largest cryogen CHF database assembled to date. New universal CHF correlations are developed for two distinct CHF mechanisms based on careful physics-based segregation of the data, showing good predictive agreement with the database.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Vishwanath Ganesan, Raj Patel, Jason Hartwig, Issam Mudawar
Summary: In this study, a comprehensive database is developed by mining data from global literature to investigate the film boiling heat transfer coefficient (HTC) of cryogens. New universal cryogen correlations are constructed based on the database, providing a research foundation for cryogenic film boiling heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Vishwanath Ganesan, Raj Patel, Jason Hartwig, Issam Mudawar
Summary: This study consolidates the largest total pressure drop database for cryogenic saturated two-phase flow so far, using experimental data from world literature dating back to 1964. The accuracy of frictional pressure gradient correlations is assessed, and new dimensionless criteria are developed to study the distinct fluid physics unique to cryogens. A hybrid correlation is then developed for the two distinct data subsets, which performs the best among all seminal correlations and provides excellent predictive agreement with the database.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
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)