Experimental Study of Heat Transfer Characteristics of Oscillating Heat Pipe with Different Numbers and Orientations of Check Valves.

Date

2024-07-21

Journal Title

Journal ISSN

Volume Title

Publisher

2024 International Conference on Environmnetal Systems

Abstract

An Oscillating Heat Pipe with Check Valves (CVOHP) is a two-phase thermal control device that is thin thickness, lightweight and has a large heat-receiving surface. In addition, a CVOHP has high heat transfer performance because it transfers heat using latent heat and sensible heat. Therefore, a CVOHP is attracting attention as a novel thermal control device for spacecraft. This study aims to clarify the optimal number and orientation of check valves to maximize the heat transfer performance of the CVOHP. The experiments were conducted using four types of 15-turn CVOHP with different numbers of check valves: every turn, every two turns, every five turns, and no check valves. The effect of the orientation of the check valves was also investigated in two cases. One was a case where the check valves allowed flow from the cooling section to the heating section (forward orientation), and the other was the opposite (backward orientation). The result showed that in the forward case, the thermal resistance decreased as the number of check valves increased. On the other hand, in the case of the backward case, the thermal resistance increased as the number of check valves increased, and the maximum heat transfer capability deteriorated significantly compared to the forward orientation. Based on the results of this study, it is recommended to install check valves at each turn in the forward orientation to maximize the heat transfer performance.

Description

Ayumu Kawaguchi, Department of Aerospace Engineering, Tohoku University, Japan
Yuzen Sasaoka, Department of Aerospace Engineering, Tohoku University, Japan
Makiko Ando, Japan Aerospace Exploration Agency (JAXA), Japan
Atsushi Okamoto, Japan Aerospace Exploration Agency (JAXA), Japan
Tsubasa Ikami, Institute of Fluid Science, Tohoku University, Japan
Hiroki Nagai, Institute of Fluid Science, Tohoku University, Japan
ICES201: Two-Phase Thermal Control Technology
The 53rd International Conference on Environmental Systems was held in Louisville, Kentucky, USA, on 21 July 2024 through 25 July 2024.

Keywords

Oscillating Heat Pipe, Check Valves, Two-phase flow, Phase change, Experimental study

Citation