Flow and heat transfer characteristics in cooling lamilloy with internal MCs

Tao, Yang; Sun, Yu; Li, Xu; Xu, Yang; Duan, Deliang; Xi, Lei; Gao, Jianmin; Li, Yunlong

doi:10.1016/j.ijheatmasstransfer.2022.123645

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…Singh et al [26] has pointed out that the RNG k − ε model has the best accuracy for simulating zigzag MCHS. In addition, according to our study of similar structures, we have found that the RNG k − ε model is more suitable for the prediction of lamilloy cooling with internal channels [44,45]. Therefore, in this work, the RNG k − ε model was utilized using the commercial program ANSYS CFX 17.0.…”

Section: Brief Description Of Cfd Modelingmentioning

confidence: 99%

Multi-Objective Optimization of the Microchannel Heat Sink Used for Combustor of the Gas Turbine

Zhang,

Yang,

Chang

et al. 2024

Energies

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This research presents a surrogate model and computational fluid dynamic analysis-based multi-objective optimization approach for microchannel heat sinks. The Non-dominated Sorting Genetic Algorithm is suggested to obtain the optimal solution set, and the Kriging model is employed to lower the simulation’s computational cost. The physical model consists of a coolant chamber, a mainstream chamber, and a solid board equipped with staggered Zigzag cooling channels. Five design variables are examined in relation to the geometric characteristics of the microchannel heat sinks: the length of inlet of the cooling channels, the width of the cooling channels, the length of the “zigzag”, the height of the cooling channels, and the periodic spanwise width. The optimal geometry is established by choosing the averaged cooling effectiveness and coolant mass flow rate which enters the mainstream chamber through the microchannel heat sinks as separate objectives. From the Pareto front, the optimal microchannel heat sinks structures are obtained. Three optimized results are studied, including the maximum cooling effectiveness, minimum coolant mass flow rate, and a compromise between the both objectives; a reference case using the median is compared as well. Numerical assessments corresponding to the four cases are performed, and the flow and cooling performance are compared. Furthermore, an analysis is conducted on the mechanisms that impact the ideal geometric parameters for cooling performance.

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Section: Brief Description Of Cfd Modelingmentioning

confidence: 99%

Multi-Objective Optimization of the Microchannel Heat Sink Used for Combustor of the Gas Turbine

Zhang,

Yang,

Chang

et al. 2024

Energies

Self Cite

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“…Our research group has designed an innovative lamilloy cooling structure with two separate, staggered, internal MCs [26]. Earlier research results revealed that the average η can be improved by four times, under the same coolant consumption.…”

Section: Introductionmentioning

confidence: 99%

Study on Flow and Heat Transfer Characteristics in Lamilloy Structure with Different Configurations of Internal Minichannels

Yang,

Zhang,

Chang

et al. 2023

Energies

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This paper proposes a novel lamilloy cooling structure equipped with internal minichannels used in a combustor flame cylinder. The overall flow and heat transfer characteristics of three different internal minichannel configurations (parallel-flow, counter-flow, and staggered arrangements. PF, CF, and SF for short) are analyzed and compared. From the analysis of the heat transfer characteristic, it is found that the CF structure possesses the best cooling effect and temperature uniformity. The average cooling effectiveness (ηave) of the CF structure increased by 20.6% and 20.4%, and the average temperature gradient ((dT/dX)ave) decreased by 76.9% and 32.8%, compared with the SF structure and PF structure, respectively. From the analysis of flow characteristics, the coolant ejected from the minichannel one region of the SF structure completely blocks the direct contact between the mainstream and the lamilloy, while transferring more from the mainstream to the minichannel two region. Different from the SF structure, film cooling at the two outlet of the CF structure transfers most of the mainstream to the lower position, which further improves the cooling effect of the two internal minichannels.

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A conjugate heat transfer investigation of outer-wall cooling performance in double-wall vane pressure side

Wang,

Hu,

Yang

et al. 2024

Numerical Heat Transfer, Part A: Applications

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Flow and heat transfer characteristics in cooling lamilloy with internal MCs

Cited by 3 publications

References 25 publications

Multi-Objective Optimization of the Microchannel Heat Sink Used for Combustor of the Gas Turbine

Multi-Objective Optimization of the Microchannel Heat Sink Used for Combustor of the Gas Turbine

Study on Flow and Heat Transfer Characteristics in Lamilloy Structure with Different Configurations of Internal Minichannels

A conjugate heat transfer investigation of outer-wall cooling performance in double-wall vane pressure side

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