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Über dieses Buch

The main aim of this book is to introduce and give an overview of a novel, easy, and highly effective heat transfer augmentation technique for single-phase micro/minichannel heat sink. The specific objectives of the volume are to: Introduce a novel planar oblique fin microchannel and cylindrical oblique fin minichannel heat sink design using passive heat transfer enhancement techniques Investigate the thermal transport in both planar and cylindrical oblique fin structures through numerical simulation and systematic experimental studies.

Evaluate the feasibility of employing the proposed solution in cooling non-uniform heat fluxes and hotspot suppression Conduct the similarity analysis and parametric study to obtain empirical correlations to evaluate the total heat transfer rate of the oblique fin heat sink Investigate the flow mechanism and optimize the dimensions of cylindrical oblique fin heat sink Investigate the influence of edge effect on flow and temperature uniformity in these oblique fin channels.



Chapter 1. Introduction

This chapter introduces the background and motivation of the present study. The objectives and scope are also outlined along with the organization of the book.
Yan Fan, Poh Seng Lee, Pawan Kumar Singh, Yong Jiun Lee

Chapter 2. Planar Oblique Fin Microchannel Structure

In a conventional microchannel heat sink, boundary layers continue to develop as liquid coolant travels downstream. Consequently, convective heat transfer performance of the heat sink deteriorates in the axial direction, resulting in elevated maximum temperature, and significant temperature gradient across the heat sink. This chapter proposes a novel heat transfer enhancement scheme, employing sectional oblique fins to replace conventional parallel fins in a planar microchannel heat sink. In this chapter, a simplified simulation model is initially adopted to study the occurrence of boundary layer redevelopment and secondary flow generation through the oblique channels and the effect to fluid flow and heat transfer. This chapter also conducts experimental validation of the proposed heat transfer augmentation technique using copper-based microchannel heat sinks. In addition, catering to the non-uniform heat fluxes dissipation and mitigating hotspots on electronic devices, tailoring of local heat transfer performance using oblique fins is presented to suppress the hotspots in the later sections. Subsequently, experimental investigation with different hotspot conditions is conducted to demonstrate and validate the feasibility of this concept.
Yan Fan, Poh Seng Lee, Pawan Kumar Singh, Yong Jiun Lee

Chapter 3. Cylindrical Oblique Fin Minichannel Structure

A novel cylindrical oblique fin minichannel heat sink, in the form of an enveloping jacket, is proposed to be fitted over cylindrical heat sources. This chapter provides a description on the numerical simulation and experimental investigation for both conventional and cylindrical oblique fin minichannel, a similarity analysis and parametric study for oblique fin minichannel heat sink and an edge effect investigation. The objectives include: (1) validate the applicability of conventional theories and simulation results in predicting heat transfer performance for cylindrical oblique fin minichannel, (2) explore the flow mechanism and optimize the structure of cylindrical oblique fin heat sink for its best overall heat transfer performance and (3) understand how the edge effect influences the flow and temperature uniformity due to the generation of secondary flows in the minichannels. In this chapter, minichannel geometry consideration, simulation model set-up, test section design, experimental set-up and data analysis are presented; various flow distributions are investigated and reported, as the secondary channel gap, oblique angle and Reynolds number are varied; multiple correlations for the average Nusselt number and the apparent friction constant are obtained and discussed; the edge effect for oblique finned structure is examined. Lastly, key conclusions are discussed and presented for this chapter.
Yan Fan, Poh Seng Lee, Pawan Kumar Singh, Yong Jiun Lee

Chapter 4. Conclusions and Future Works

Key accomplishments of the present study, significances, limitations and recommendations for future work are summarized in this chapter.
Yan Fan, Poh Seng Lee, Pawan Kumar Singh, Yong Jiun Lee
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