Article
Engineering, Chemical
Hao Cui, Lang Wang, Xueying Li, Jing Ren
Summary: This study combines a data-driven method with decoupled conjugate heat transfer analysis to analyze a typical air-cooled gas turbine first-stage vane with film cooling, impingement cooling, and pin-fin cooling. The results show that this method significantly shortens the time of the heat transfer analysis process and ensures accuracy, proving the effectiveness of the data-driven method for evaluating modern gas turbine cooling design.
Article
Thermodynamics
Ran Yao, Hang Su, Yun Cheng, Jianhua Wang, Jian Pu
Summary: The study introduces a novel multistage swirl cooling configuration that can significantly enhance cooling performance and reduce surface temperature, but at the expense of increased total pressure loss. By modifying the bends connecting adjacent stages into round-shaped ones, the pressure loss can be significantly decreased, leading to higher thermal performance of the multistage swirl cooling models compared to the single-stage model.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Thermodynamics
Xu Wang, Huazhao Xu, Jianhua Wang, Wei Song, Lei Wang
Summary: This study investigated the internal cooling characteristics of turbine blades in a realistic rib roughened two-pass channel and found that the type of wall boundary conditions had a significant impact on blade internal cooling performance, with blade rotation leading to a significant increase in heat transfer on the trailing surface.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Inderjot Kaur, Youssef Aider, Karthik Nithyanandam, Prashant Singh
Summary: Gas turbine blade trailing edge cooling is a challenging task due to strict geometrical constraints and thermal stresses. Traditional pin-fin structures are commonly used for internal cooling, but lattice structures have shown better heat transfer performance. In this study, four different lattice unit cell topologies were additively manufactured in 420 Stainless Steel using Binder Jetting technology, and their heat transfer capabilities were evaluated.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Seok Min Choi, Minho Bang, Hee Koo Moon, Hyung Hee Cho
Summary: The wake effects on heat transfer coefficient distributions on the turbine blade tip and shroud are influenced by different configurations of the turbine blade tip and shroud, as well as five different tip shapes. The wake effects induce relatively uniform heat transfer distributions on the tip & shroud, with similar magnitudes in a specific region. Ultimately, considering reduced total pressure loss coefficients and heat transfer coefficient distributions, the vertical rib case may be the best option for the turbine blade tip.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Li 'ang Li, Hongwu Deng, Haiwang Li, Yi Huang
Summary: In this study, a latticework channel heat exchanger is investigated numerically. It is found that the latticework channel can generate and maintain a longitudinal vortex naturally, leading to enhanced heat transfer without additional vortex generators. The Nusselt number is increased by 3-10 times compared to a straight channel. Different heat transfer improvements can be achieved by adjusting the design parameters.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
JeongJu Kim, Wonjik Seo, Heeyoon Chung, Minho Bang, Hyung Hee Cho
Summary: This study investigated the aerothermal performance of three squealer blade tip configurations, finding that the inclined shelf squealer tip demonstrated the best performance in reducing both heat loads and aerodynamic losses.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
L. F. Marques, J. K. Rogenski, L. F. Souza
Summary: Go?rtler instability studies take into account a more realistic geometry represented by the pressure side of a turbine blade. The creation and maintenance of Go?rtler vortices are observed in regions where the centrifugal effect exists but decays. The weak aspect of the instability leads to the selection of the preferred wave number to a receptivity problem, while shear and heat studies show transfer rates higher than those observed in a fully turbulent regime.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Zequn Du, Haiwang Li, Ruquan You, Yi Huang
Summary: The impact of thermal barrier coating thickness and surface roughness on the cooling characteristics of high-pressure turbine blades was investigated using the conjugate heat transfer method. The results showed that coating thickness and surface roughness had effects on the heat flux and overall cooling effectiveness of the blades.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jose Alfredo Rodrigez Ramirez, Christian Marisol Clemente Mirafuentes, Manuela Alejandra Zalapa Garibay, Juan Garcia C. Castrejon, Luis Gonzalo Guillen Anaya
Summary: The corrosion fatigue behavior of AISI 410 martensitic stainless steel used in steam turbine blade fabrication was studied using the EN technique under mechanical fatigue conditions. Pitting corrosion occurred in a simulated environment, generating sites for crack initiation and propagation. The presence of localized plastic deformation and the breakdown of the passive layer led to a significant increase in crack propagation velocity and reduced material lifespan.
Article
Thermodynamics
Zhi Tao, Zhendong Guo, Boyang Yu, Liming Song, Jun Li
Summary: The article introduces the use of non-axisymmetric endwalls in the thermal management of gas turbine endwalls, demonstrating its effectiveness in large-turning-angle gas turbines and obtaining optimal solutions through three optimizations. Through a fundamental flow-thermal analysis of the three optimal solutions, insights into the effects of non-axisymmetric endwalls on gas turbine aerothermal performance are gained.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Hao Lu, Wenjun Zhao
Summary: This study investigated the effects of different airflow regimes and conjugate heat transfer on particle deposition characteristics, finding that particle deposition velocities increase significantly for small particles but remain constant for large particles. The thermophoresis effect is reduced by the conjugate heat transfer, and different flow regimes have obvious effects on particle deposition velocities.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Feng Li, Zhao Liu, Yong Tao, Weixin Zhang, Zhenping Feng
Summary: This study investigates the cooling effectiveness and heat transfer characteristics of the blade tip in a gas turbine through experiments and numerical simulations. The results reveal that convection in film holes is the major factor affecting the heat transfer process at the tip region.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xing Yang, Florian Seibold, Zhenping Feng, Bernhard Weigand
Summary: This study numerically investigates the flow and heat transfer behavior of swirl cooling in leaned, convergent tubes. The results show that the unsteady RANS method effectively captures the flow characteristics and heat transfer performance of swirling flows. The use of leaned tubes with Dean vortices improves heat transfer and reduces flow loss compared to straight tubes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Muhammad Zia Ullah Khan, Bilal Akbar, Ramisha Sajjad, Umair Ahmed Rajput, Sanaullah Mastoi, Emad Uddin, Azhar Hussain, Md Yamin Younis, Fausto Pedro Garcia Marquez, Naveed Akram
Summary: This study investigates heat transfer enhancement in a straight rectangular channel with and without disturbances in the form of dimple protrusions. The results show that circular dimple-protrusion channels are effective for high Reynolds numbers, while through dimple protrusion channels are efficient for intermediate Reynolds numbers. Additionally, the addition of copper oxide nanoparticles improves heat transfer performance in the channels.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Duy-Tan Vo, Hyoung-Tak Kim, Junghyuk Ko, Kwang-Hyun Bang
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2020)
Article
Mathematics
Thanh Dam Mai, Jaiyoung Ryu
Article
Mathematics
Thanh Dam Mai, Jaiyoung Ryu
Summary: Gas turbine blades are susceptible to damage under high-pressure, high-temperature conditions, which increases heat-transfer coefficients and mechanical stress, reducing fatigue life. Damaged blades also increase aerodynamic force on the blade surfaces, further affecting mechanical stress and fatigue life.
Article
Thermodynamics
Duy-Tan Vo, Thanh Dam Mai, Byungwook Kim, Jaiyoung Ryu
Summary: This study investigates the effects of thermal barrier coating thickness and coolant on the heat transfer in turbine blades. The results show that the leading tip, trailing tip, platform, and leading edge regions have higher thermal stresses. Coolants with higher temperature are less effective in cooling the blade, and the coolant temperature has a significant impact on the blade temperature.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Marine
Thanh Dam Mai, Seunggi Kim, Kyoungsik Chang, Sang-Wook Lee, Minjae Kim, Jaiyoung Ryu
Summary: This study investigates the effects of different riblet types on the drag force of submarine surfaces. The results show that riblet surfaces reduce friction drag while increasing pressure drag, leading to a significant impact on total drag. The theoretical predictions are in good agreement with the simulation results.
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)
