Article
Green & Sustainable Science & Technology
Bairi Levi Rakshith, Lazarus Godson Asirvatham, Appadurai Anitha Angeline, Stephen Manova, J. Jefferson Raja Bose, J. Perinba Selvin Raj, Omid Mahian, Somchai Wongwises
Summary: This article provides an overview of the latest advancement in the design and operation of TGPs and its applications. It also summarizes recent experimental and numerical investigations on different types of TGPs. The heat transfer characteristics and mechanisms involved when using different working fluids, wick structures, and materials for enhancing the heat transfer performance and operating range of TGPs are discussed.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Thermodynamics
Sai Kiran Hota, Kuan-Lin Lee, Brett Leitherer, George Elias, Greg Hoeschele, Srujan Rokkam
Summary: Two-phase-based heat spreaders are highly sought after for electronics cooling due to their superior thermal performance. Pulsating Heat Pipes (PHPs) offer thickness, shape, and cost advantages over Embedded Heat Pipe (EHP) spreaders. The thermal performance of PHP with different fluids was experimentally determined and compared to EHP. A mathematical model was developed and validated. Propylene-filled PHP performs similarly or better than EHP at low sink temperatures but dries out faster at moderate temperatures. PHP with R245fa and acetone improves with increasing power but has lower thermal conductivity compared to EHP. PHP is lighter than EHP based on weight comparison.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Joo Hyun Moon, Dani Fadda, Dong Hwan Shin, Jin Sub Kim, Jungho Lee, Seung M. You
Summary: A new concept of wickless and flat thermal ground plane (TGP) is proposed to dissipate heat from concentrated sources, using boiling heat transfer. Experimental results show that this new TGP can achieve low thermal resistance at different operating temperatures, with excellent performance and lighter weight compared to traditional methods.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Ji Li, Xingping Li, Guohui Zhou, Yang Liu
Summary: The study developed a super-large aluminum-based flat heat pipe heat spreader that effectively manages thermal loads up to 80 W, and combined it with a finned heat sink to test its heat dissipation capability under natural convection conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
S. R. Akhil Krishnan, Suresh Sivan, V. C. Midhun, Soumya Ranjan Behera
Summary: Advancements in PCM technology provide adaptable solutions for high heat dissipation in electronic devices. This study investigates the influence of NPG as a solid-solid phase transition PCM on the functionality of a heat pipe-assisted heat sink. Experimental and numerical analysis shows that the integration of PCM and heat pipe in the heat sink outperforms other configurations, with a maximum enhancement ratio of 3.29. The heat sink assembly with 99% PCM and heat pipe demonstrates the most significant results, while the assembly without heat pipe performs best for 66% PCM.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Xiaomeng Wang, Joo Hyun Moon, Dani Fadda, Dong Hwan Shin, Jungho Lee, Seung M. You
Summary: A thermal ground plane (TGP) device effectively spreads concentrated heat into a large area. The selected TGP utilizes bubble pumping to circulate fluid and keep the hot area wetted. The study investigates the effects of chamber thickness on the TGP's thermal performance.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jiale Huang, Jianhua Xiang, Xuyang Chu, Wenjie Sun, Ruiliang Liu, Weisong Ling, Wei Zhou, Sulian Tao
Summary: The Y-shaped flexible branch heat pipe was designed to improve the thermal performance of the polymer tube. Various structural parameters were studied to investigate their effects on the cooling ability, heat load, thermal resistance, and anti-gravity performance of the flexible heat pipe. The findings show that the thermal resistance and cooling performance are interdependent, and the total cooling performance may degrade if one of the condensers fails.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Physical
Heng Cui, Quan Zhang, Yiwen Bo, Peijia Bai, Mengyan Wang, Chunyang Zhang, Xiaoshi Qian, Rujun Ma
Summary: The microfluidic cooling system is a promising solution for chip-scale thermal management. However, there is currently no existing electrocaloric cooling device that offers continuous sub-ambient liquid media. In this study, a self-standing flexible electrocaloric capillary tube was fabricated, achieving the highest specific device cooling power density among all reported electrocaloric devices.
Article
Energy & Fuels
Salman Ahmed, Senji Li, Zhenpeng Li, Gang Xiao, Tao Ma
Summary: This study proposes a new system configuration to maximize the radiative cooling potential of solar cells. Results show that the proposed system can significantly reduce cell temperature and improve electrical efficiency compared to traditional glass-coated modules.
Article
Green & Sustainable Science & Technology
Youtang Wang, Xuyang Liu, Chengyu Li, Bin Zheng, Chunguang Wang, Xin Tian
Summary: In the application of borehole thermal energy storage, ground heat exchangers can show thermal buckling under high temperature load, but increasing initial confining pressure can reduce thermal deformation and residual deformation of the pipe. Buried pipes with symmetrical arc structure can exhibit asymmetric strains and deformation distribution.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Energy & Fuels
Jalal M. Jalil, Hussein S. Mahdi, Asim S. Allawy
Summary: The effects of using phase change material (PCM) on heat sink cooling performance were investigated in this study. The experiments showed that the use of PCM significantly reduced the temperatures of the heat sink. Additionally, the study found that adding nanoparticles to the PCM improved heat sink performance.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Chemical
Bing Cai, Weizhong Deng, Tong Wu, Tingting Wang, Zhengyuan Ma, Wei Liu, Lei Ma, Zhichun Liu
Summary: This study explores the influence of using a pouring silicate wick on the production and performance of loop heat pipes. The results show that the system can operate stably, adapt well to changes in heat load, and have good heat load matching capabilities.
Article
Thermodynamics
Noriyuki Watanabe, Takuji Mizutani, Hosei Nagano
Summary: A miniature loop heat pipe (mLHP) has been developed for cooling compact wide bandgap power semiconductors with high heat flux and high allowable operating temperature. The mLHP, consisting of an evaporator, a condenser, and transport tubes, can achieve excellent heat transfer performance using specific materials and cooling methods. The proposed steady-state numerical model is consistent with experimental results, with a relative error of 7%.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Nanoscience & Nanotechnology
Qiaoli Wang, Tianshuo Li, Yafei Ding, Huibao Chen, Xiyue Cao, Jianfei Xia, Baowen Li, Bin Sun
Summary: A stretchable thermoplastic polyurethane (TPU)-boron nitride nanosheet (BNNS) composite film with high in-plane thermal conductivity has been developed for thermal management of flexible/stretchable electronics. It effectively reduces temperature and enhances thermal dissipating property.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Thermodynamics
Juan Zhao, Mingsheng Du, Zhen Zhang, Xiang Ling
Summary: With the development of electronic technology, a thermal management strategy combining flat-plate heat pipe (FPHP) and spray cooling was designed to improve heat dissipation performance. The best performance was achieved at a heat flux of 20-40 W/cm(2), with the lowest thermal resistance and highest thermal conductivity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Puqing Jiang, Dihui Wang, Zeyu Xiang, Ronggui Yang, Heng Ban
Summary: A new spatial-domain thermoreflectance (SDTR) method has been developed to measure the in-plane thermal conductivity of small-scale samples. This method can measure samples lacking in-plane symmetry and extends the limit of measurable thermal conductivity to as low as 1 W / (m.K), with high accuracy and ease of operation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Multidisciplinary
Dezhao Huang, Qiangsheng Sun, Zeyu Liu, Shen Xu, Ronggui Yang, Yanan Yue
Summary: The authors developed a tip-enhanced Raman thermometry approach to study thermal transport at nanoscale hotspots and predicted the phonon mean free path through a combination of experiments and simulations.
Article
Chemistry, Multidisciplinary
Lu Chen, Te-Huan Liu, Xiangze Wang, Yandong Wang, Xiwei Cui, Qingwei Yan, Le Lv, Junfeng Ying, Jingyao Gao, Meng Han, Jinhong Yu, Chengyi Song, Jinwei Gao, Rong Sun, Chen Xue, Nan Jiang, Tao Deng, Kazuhito Nishimura, Ronggui Yang, Cheng-Te Lin, Wen Dai
Summary: The rapid development of highly integrated microelectronic devices leads to a demand for advanced thermally conductive adhesives (TCAs) to solve the issue of heat transfer. Metal nanoflakes with a natural 2D structure and isotropic thermal conductivity are promising fillers for high-performance TCAs. However, achieving TCAs with thermal conductivity over 10 W m(-1) K-1 at filler content below 30 vol% remains challenging. This study introduces a top-down strategy to prepare 2D Ag nanoflakes with an intrinsic thermal conductivity of 398.2 W m(-1) K-1, reaching 93% of the theoretical value, and demonstrates their superior heat transfer efficiency in microelectronic cooling performance evaluations.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Zeyu Xiang, Yu Pang, Xin Qian, Ronggui Yang
Summary: Characterizing spatially varying thermal conductivities is crucial for understanding the structure-property relation in various thermal functional materials. This study presents a machine-learning-based method for directly extracting depth-dependent thermal conductivity profiles from pump-probe phase signals. The proposed method demonstrates excellent performance in accurately reproducing different types of thermal conductivity profiles and shows potential for depth-dependent thermal property mapping.
APPLIED PHYSICS LETTERS
(2023)
Review
Chemistry, Physical
Changkang Du, Xinpeng Zhao, Xin Qian, Congliang Huang, Ronggui Yang
Summary: Solar evaporation technology, which is free of fossil fuel consumption and carbon dioxide emission, has attracted significant research interest in recent years. Although many systems have achieved high evaporation efficiency, the upper limit of this efficiency is not bounded by 100%. In this article, the thermodynamic limit of solar evaporation efficiency is analyzed, and the challenges and potential improvements for heat-localized solar evaporation and their hybrid systems are discussed.
Article
Chemistry, Physical
Zesheng Yang, Muzhang Huang, Ronggui Yang, Jingbo Sun, Xuefei Zhang, Wei Pan, Chunlei Wan
Summary: The high operation temperature of next generation gas turbines poses a challenge for the durability of metallic turbine blades due to near-infrared (NIR) thermal radiation. Although thermal barrier coatings (TBCs) are used for thermal insulation, they are transparent to NIR radiation. This study introduces an NIR metamaterial consisting of Gd2Zr2O7 ceramic matrix with dispersed Pt nanoparticles, which achieves a broadband NIR extinction and effectively shields radiative heat transfer.
Article
Materials Science, Multidisciplinary
Tianbo Lu, Boyi Wang, Guodong Li, Jiawei Yang, Xiaofan Zhang, Nan Chen, Te-Huan Liu, Ronggui Yang, Pingjuan Niu, Zongxiang Kan, Hangtian Zhu, Huaizhou Zhao
Summary: In order to meet the increasing demand for thermoelectric cooling in high heat flux systems, it is necessary to construct high-performance thermoelectric devices with materials that have both high thermoelectric properties and mechanical strength. However, improving the thermoelectric and mechanical properties simultaneously is challenging due to the anisotropic thermal and electrical transports in the layered structure of Bi2Te3. In this study, a hot extrusion (HE) technique was developed to manipulate the texture ordering in Bi2Te3 material, resulting in significant improvements in thermoelectric and mechanical properties.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Yiteng Tu, Xinyu Tan, Guiguang Qi, Xiongbo Yang, Xiqiao Ouyang, Wensheng Yan, Weiwei Hu, Jialin Geng, Ronggui Yang
Summary: Daytime radiative cooling, a passive cooling technology, has attracted significant interest due to its zero energy consumption and zero greenhouse gas emissions. We propose a spectrally selective coating based on tri-cyclodecane dimethanol diacrylate (DCPDA) monomer, which can be fabricated with simple and scalable methods. The coated glass exhibits high transmissivity in the visible wavelengths and high thermal emissivity in the atmospheric window. Outdoor cooling tests demonstrate the sub-ambient cooling capability of the coating applied to aluminum sheets, making it a promising solution for transparent radiative cooling applications.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Yuchi Chen, Qiangqiang Huang, Te-Huan Liu, Xin Qian, Ronggui Yang
Summary: This study used molecular dynamics simulations to predict the thermopower of the redox pairs Fe(CN)6(3-)/Fe(CN)6(4-) and Fe3+/Fe2+, and found excellent agreement with experimental values. It was discovered that the thermopower of Fe3+/Fe2+ can be increased from 1.7+/-0.4 mV/K to 3.8+/-0.5 mV/K by increasing the acetone to water fraction. This increase was attributed to the intercalation of acetone molecules into the first solvation shell of Fe2+ at high acetone fractions.
Article
Thermodynamics
Qiangqiang Huang, Yuchi Chen, Xin Qian, Ronggui Yang
Summary: The utilization of low-grade heat sources has been a long-standing challenge due to the limited temperature difference. This study shows that coupling a thermally regenerative electrochemically cycled flow battery with radiative coolers can enhance the energy density and generate additional operating temperature difference. The model also captures the effects of mass transfer and electrochemical kinetics on power density and efficiency.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Thermodynamics
Jing Wu, Hao Zhang, Tianyu Wang, Xin Qian, Bai Song, Te-Huan Liu, Ronggui Yang
Summary: In this study, the pressure-dependent thermal conductivity of isotope-engineered cubic boron nitride (c-BN) was investigated using ab initio calculations and the Boltzmann transport equation. It was found that the thermal conductivity of isotopically mixed c-BN is less sensitive to pressure variations compared to isotope-enriched c-BN. The results provide a fundamental understanding of pressure-dependent phonon transport in c-BN from a microscopic perspective.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Manufacturing
Orion L. Kafka, Jake Benzing, Newell Moser, Li-Anne Liew, Jordan Weaver, Nikolas Hrabe
Summary: This additive manufacturing benchmarking challenge involved predicting stress-strain behavior and fracture location of a tension specimen made from a wafer of nickel alloy IN625 manufactured by laser powder bed fusion (L-PBF). The challenge provided data on chemical composition, grain and sub-grain structure, and pore structure of the specimen. Prediction responses from six different groups were collected, and while some values were over- or under-predicted, no single model performed best at all predictions. Failure-related properties, including fracture prediction, proved to be particularly challenging. Discussions on improving model maturity and measurement uncertainty were also provided.
INTEGRATING MATERIALS AND MANUFACTURING INNOVATION
(2023)
Article
Chemistry, Multidisciplinary
Hao Zhang, Yongsheng Ji, Yonggang Yao, Long Qie, Zhiheng Cheng, Zhihao Ma, Xin Qian, Ronggui Yang, Chenghang Li, Yaqing Guo, Yifei Yuan, Haoyu Xiao, Haiping Yang, Jing Ma, Jun Lu, Yunhui Huang
Summary: Battery recycling is becoming increasingly important due to the widespread use of Li-ion batteries. Direct recycling methods have advantages of high-purity material recovery and lower environmental impact, but most methods are complex and have low yield. This study presents a transient recycling approach with high efficiency for battery materials, achieving a recovery ratio of over 97% and intact metal foil of nearly 100% through shock-type or rolled-over heating.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Green & Sustainable Science & Technology
Weiping Xu, Sihong Gong, Ningsheng Wang, Wenbo Zhao, Hongle Yin, Ronggui Yang, Xiaobo Yin, Gang Tan
Summary: Radiative cooling technology, using a membrane with spectrum-selective optical properties, has been shown to effectively reduce temperatures in grain storage warehouses. Field testing in Hangzhou, China demonstrated temperature reductions of up to 9.8°C and 4°C in headspace and grain respectively. By creating a building model, it was found that significant electricity savings and temperature reductions can be achieved without the use of air conditioning.
Article
Chemistry, Multidisciplinary
Rongfu Wen, Yushan Ying, Xuehu Ma, Ronggui Yang
Summary: Inhibiting frost formation is crucial for industrial applications. This study proposes a counterintuitive approach to achieve sustainable anti-frosting by accelerating the nucleation-to-departure cycle of condensed liquid. The results show that a frost-free surface can be maintained with high heat flux subcooled condensation for more than 5 hours.
CELL REPORTS PHYSICAL SCIENCE
(2022)
