Pool Boiling Heat Transfer Analysis on Aluminum Microporous Structures in Acetone
- 주제(키워드) Pool boiling , Two-phase heat transfer , Boiling heat transfer , Surface enhancement
- 주제(DDC) 621.8
- 발행기관 아주대학교 일반대학원
- 지도교수 Jungho Lee
- 발행년도 2025
- 학위수여년월 2025. 2
- 학위명 석사
- 학과 및 전공 일반대학원 기계공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000034348
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Boiling heat transfer is essential for high heat flux thermal management due to its high heat transfer coefficient and temperature stability. Despite the use of aluminum and acetone in phase-change devices, pool boiling studies on this combination are limited, hindering optimization. This study conducts pool boiling experiments using acetone on smooth and microporous aluminum surfaces. A smooth aluminum surface with roughness Ra 0.096 μm served as the baseline, leading to new Rohsenow's correlation constants (Csf = 0.064, m = 0.15) for the aluminum-acetone system. Microporous surfaces were created by brazing aluminum particles of diameters 14.5 μm, 34.3 μm, and 66.7 μm, with varying coating thicknesses. Microporous surfaces significantly enhanced boiling performance: wall superheat decreased by up to 23 K, and critical heat flux (CHF) increased by up to 60%. Optimal coating thicknesses were identified for each particle size. At high heat fluxes, the heat transfer coefficient varied notably, increasing with thicker coatings due to boiling enhancement and decreasing due to bubble departure resistance. Smaller particles increased nucleation site density, amplifying these effects. Also, by modifying Zuber's factor K, we developed a CHF correlation applicable to particle-based microporous surfaces, which agreed with our data and matched within 30% of previous results. These findings aid in optimizing microporous surface design for efficient thermal management systems.
more목차
1. Introduction 1
1-1. The Use of Aluminum in Boiling Heat Transfer 1
1-2. Working Fluids Used with Aluminum 2
1-3. Objectives of This Study 3
2. Method 7
2-1. Aluminum microporous surface 7
2-2. Experimental apparatus 8
2-3. Experimental Procedure 10
2-4. Data reduction and Uncertainty analysis 11
3. Results and discussion 20
3-1. Pool boiling test results of smooth aluminum surface 20
3-2. Pool boiling results of aluminum microporous surfaces 21
3-3. Correlation for predicting CHF 27
4. Conclusions 42
References 45
