Article
Thermodynamics
Han Yan, Lei Luo, Junfeng Zhang, Wei Du, Dan Huang, Songtao Wang
Summary: This study investigates the influences of dimple location on the heat transfer performance of a pin fin-dimpled channel with upright/curved/inclined pin fins under both stationary and rotating conditions. The results show that the pin fin plays a dominant role in heat transfer performance compared to the dimple. The heat transfer performance is critically affected by the interaction of the longitudinal secondary flow and jet-like flow. The dimple location significantly affects the formation, development, and impingement of jet-like flow and longitudinal secondary flow. The dimple located at the behind position exhibits the poorest heat transfer enhancement. The originality of this study lies in evaluating the heat transfer performance of the combined cooling structure of dimple and pin fin, providing valuable insights for turbine blade design.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Engineering, Aerospace
Lei Luo, Han Yan, Wei Du, Wentao Su, Songtao Wang, Dan Huang
Summary: This paper introduces a novel curved pin fin for enhancing the heat transfer performance of aeroengine turbine blades. The effects of inclination angle and vertical segment length of the curved pin fin on the heat transfer performance are investigated. The results show that curved pin fins with smaller inclination angle and shorter vertical segment exhibit lower friction factor and better thermal performance. Compared to upright pin fins, the thermal performance of curved pin fins with inclination angle of 45 degrees and vertical segment length of 3 is improved by 6.1% and 14.4% respectively.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Miftah Altwieb, Rakesh Mishra, Aliyu M. Aliyu, Krzysztof J. Kubiak
Summary: This study experimentally investigated the flow/heat transfer characteristics of three different heat exchanger geometries and found that louvred fins have the highest heat transfer rate but also the highest pressure drops. The new perforated design showed slightly higher pressure drop but higher heat transfer rate, especially at lower liquid flow rates. Two novel semiempirical relationships were derived to predict the heat exchanger's Fanning and Colburn factors as functions of fin surface area and Reynolds number, and the predictions were within +/- 15% of the experiments.
Article
Thermodynamics
Yacine Khetib, Khaled Sedraoui, Abdellataif Gari
Summary: This study numerically investigated a micro-pin-fin heat sink to improve its cooling capability and productivity. It found that the RS configuration had the maximum heat transfer while also yielding the maximum pressure drop.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Zhenxing Zhao, Bin Hu, Jing He, Mei Lin, Hanbing Ke
Summary: In order to ensure the normal operation of electronic devices, it is crucial to design an efficient cooling system. This study analyzed the two-phase flow boiling performance of staggered pin finned channels using the Mixture multiphase model. The influence of different fin cross-section shapes (circular, triangular, diamond, and pentagonal) on flow boiling heat transfer, pressure drop, and temperature uniformity under different heat flux conditions were compared. The results showed that the pentagonal finned channel is the most effective in terms of heat transfer coefficient, pressure drop, and temperature uniformity.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Sudharani Panda, Rakesh Kumar
Summary: The thermal and flow characteristics of a dimple imprinted absorber plate solar air-heater were investigated numerically in this study. The results showed that the dimpled surface demonstrated a significant improvement in heat transfer and friction characteristics compared to the smooth surface.
NUMERICAL HEAT TRANSFER PART A-APPLICATIONS
(2023)
Article
Thermodynamics
Ahmet Ali Sertkaya, Mukaddes Ozdemir, Eyub Canli
Summary: In this study, pin fin and plate heat sinks were investigated in terms of natural convection and radiation heat transfer by experimental means. It was found that increasing the number of pin fins up to a threshold can improve thermal performance, but beyond that threshold, the thermal convection coefficient decreases significantly. Increasing the number of pin fins partly compensates the reduction in thermal convection coefficient by increasing the surface area up to a certain level.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Manish Kumar Mohit, Rajesh Gupta
Summary: This paper investigates the thermal and flow characteristics in a microchannel with pin fins through numerical simulation. The results show that heat transfer increases significantly with an increase in fin height and Reynolds number. However, the influence of different fin heights on heat transfer differs after a certain Reynolds number.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Yunfei Yan, Ting Zhao, Ziqiang He, Zhongqing Yang, Li Zhang
Summary: The study found that stagger micro fin-shaped A pin-fin (SMFAP) exhibits the best hydro-thermal performance and has a good heat transfer effect. The structure of fin-shaped pin-fin can enhance heat transfer by increasing Nu, but can also weaken heat transfer under large pressure drop.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2021)
Article
Thermodynamics
Tehmina Ambreen, Arslan Saleem, Cheol Woo Park
Summary: This study evaluates the thermal efficiency of MXene-based nanofluid in a pin-fin heat sink through experimental and numerical analysis. The results show that using MXene coolant can significantly enhance heat transfer in the heat sink.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Liang Zhang, Wei Xiong, Jiyu Zheng, Zheng Liang, Shuai Xie
Summary: The study found that the heat transfer performance of the crosscombined dimple tube is significantly enhanced compared to the single ellipsoidal dimple tube, by changing temperature distribution and increasing the gradient in the core region. The concave surface profile can disrupt flow and enhance mixing of hot and cold fluids.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Kedam Naresh, Dmitry A. Uglanov, Evgeniy Blagin, Alexey A. Gorshkalev
Summary: The study develops unique models for heat transfer factor and friction factor for different types of fins, achieving high accuracy and applicability to experimental data, especially in the field of offset strip fins and wavy fins.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Rizwan Sabir, Muhammad Mahabat Khan, Muhammad Imran, Nadeem Ahmed Sheikh, M. Irfan
Summary: This study numerically investigates the effects of transverse dimples in thermal and hydraulic performance improvement of different tube configurations. It is found that the performance enhancement varies with turbulent Reynolds numbers, with the Ellipsoidal-45o-Star 6 dimpled tube performing better at low Reynolds numbers and the Teardrop-Star 6 and Ellipsoidal-0o-Star tubes performing better at high Reynolds numbers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Ziqiang He, Yunfei Yan, Shuai Feng, Xiuquan Li, Zhongqing Yang
Summary: The study shows that due to flow disturbance and boundary layer destruction, the ribbed pin-fin arrays heat sink (RPHS) exhibits the best performance in heat dissipation and temperature distribution uniformity. With the lowest total thermal resistance under the same pumping power, RPHS exerts the best comprehensive hydro-thermal performance overall.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Thermodynamics
Lin Liu, Te Sun, Yang Cao, Xiaolong Yu, Ling Zhang, Ziyong Cao, Lin Zhang, Weigang Xu, Shi Bu
Summary: The flow and heat transfer characteristics of a tube with an integrated internal longitudinal fin were studied through experiment and numerical simulation. The effects of inscribed circle diameter and fin included angle on the thermal performance were investigated numerically. The tube-IILF was found to have superior thermal performance compared to the ST, with a (alpha/alpha 0)/(f/f 0)1/3 value greater than 1.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
