Thermal spreading characteristics of the boiling-driven heat spreader
- 주제(키워드) Boiling-driven heat spreader , Electronics cooling , Thermal resistance , Visualization , Thermal imaging
- 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/000000034384
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
As the power density of electronic devices rapidly increases, there is a growing demand for thermal management devices capable of dissipating high heat fluxes exceeding 150 W/cm². Boiling-driven heat spreaders, which operate through boiling instead of evaporation and do not require wick structures, offer a new operational mechanism with higher thermal performance limits. While extensive research has been conducted on the superior thermal performance and potential applications of boiling-driven heat spreaders, there has been a lack of studies on the fundamental working mechanism, precise temperature distribution, and working fluids behavior. A better understanding of these aspects is crucial for optimizing the thermal performance of the boiling-driven heat spreader. This study involves the fabrication of a boiling-driven heat spreader and measures its thermal performance by assessing spreading thermal resistance, temperature uniformity, and thermal imaging. In addition, the behavior of the working fluid was visualized using high-speed imaging. The fabricated boiling-driven heat spreader achieved a very low thermal resistance of 0.1 K/W at a heat flux of 300 W/cm². Thermal imaging and high-speed visualization revealed the behavior of the working fluid and its impact on the heat spreader's thermal performance and temperature distribution. These results demonstrate that boiling-driven heat spreaders are a solution for high heat flux dissipation and provide physical insights into the design and optimization of such thermal management devices.
more목차
1. Introduction 1
2. Experimental Setup and Methodology 8
2-1. Boiling-Driven Heat Spreader 8
2-2. Experimental Setup 9
2-3. Experimental Procedure 11
2-4. Data reduction and uncertainty analysis 12
3. Thermal Performance Test Results 24
3-1. Evaluation of Boiling-Driven Heat Spreader Completeness 24
3-2. Spreading Thermal Resistance and TUI of Boiling-Driven Heat Spreader 26
3-3. Condensation Surface Temperature Distribution 28
4. Flow Visualization and Thermal Imaging Experiments 39
4-1. Flow Visualization Experimental Setup and Method 39
4-2. Thermal Imaging Experimental Setup 41
4-3. Flow Visualization and Thermal Imaging Results 42
5. Conclusion 53
References 55
