Session: 04-04: Nano/Microscale Boiling and Condensation Heat Transfer

Paper Number: 131214

131214 - A Multi-Fidelity Design Method of Heat Sink Based on Topology Optimization and Flow Boiling Simulation 

Abstract: 

A Multi-fidelity Design Method of Heat Sink Based on Topology Optimization and Flow Boiling Simulation

Yi Yuan^a, Li Chen^a,*, Chuangde Zhang^a, Wen-Quan Tao^a

a: Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049,

China

* Corresponding author: Li Chen   Email: lichennht08@mail.xjtu.edu.cn

Abstract: As a new design tool that does not rely on human intuition, topology optimization enables the design of high-performance microchannel heat sink for flow heat transfer scenario. However, it is still difficult for existing topology optimization methods to directly optimize the flow boiling heat transfer problem. The aim of this study is to explore a topology optimization process applicable to the flow boiling heat transfer problem, which is able to judge the performance of single-phase topology optimization results under flow-boiling heat transfer condition. First, a low-fidelity topology optimization is performed under single-phase flow heat transfer condition, and the resulting optimized structure is studied numerically in two-phase under different flow boiling heat transfer conditions based on a phase change model that renders the phase interfacial temperature converged to saturation temperature. Effects of heat flux, subcooling and inlet velocity on heat transfer performance are investigated numerically. The results show that the temperature at bottom increases with the increasing of heat flux, and decreases with the increasing of subcooling and inlet velocity. It is found that the single-phase optimized structure does not always have good performance under two-phase condition because the boiling occurs at the heat sink corner, and the vapor at the corner is very difficult to remove with high local temperature. Second, 12 low-fidelity topology optimized structures for different single-phase optimization objectives are designed, followed by numerical simulation and performance comparison under the same flow boiling condition. It can be found that the local high temperature and vapor discharge capacity at the heat sink corner are the main reasons for the inconsistency of the optimized structure performance under single-phase and two-phase conditions. Based on the above law, a new empirical criterion is proposed to judge whether a single-phase optimized structure has good performance in flow-boiling heat transfer. Third, a new index is proposed, which can judge the performance of the single-phase optimized structure under two-phase condition, and is tested in 12 existing structures with good conformity. In addition, this index can be directly used as the objective function of high-fidelity topology optimization, and the results show that the optimized structure with this new objective function has the best flow boiling heat transfer performance.

Keywords: topology optimization, subcooled flow boiling, multi-fidelity, volume-of-fluid method, density method

Presenting Author: Yi Yuan Xi'an Jiaotong university

Presenting Author Biography: Yi Yuan is a doctoral student at Xi 'an Jiaotong University. The main research interest is the study of phase transition processes such as boiling and condensation based on numerical simulation methods.

Authors:

Yi Yuan Xi'an Jiaotong university
Li Chen Xi'an Jiaotong university
Chuangde Zhang Xi'an Jiaotong university
Wenquan Tao Xi'an Jiaotong univerisity