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Author: Lian Zhang Publisher: Springer Science & Business Media ISBN: 9783540401810 Category : Science Languages : en Pages : 160
Book Description
Two-phase microchannel cooling is one of the most promising thermal-management technologies for future high-power IC chips. Understanding the boiling process and the two-phase flow behavior in microchannels is the key to successful implementation of a microchannel heat sink. This book focuses on the phase-change phenomena and the heat transfer in sub-150 mm diameter silicon microchannels, with emphasis on thermal measurement and modeling, and the impact of small dimensions on two-phase flow regimes. Scientists and engineers tackling thermal and MEMS problems will find the discussion in this book inspiring for their future design of microscale heat transfer experiments. This book will also contribute to the study of two-phase microchannel flows by providing extensive experimental data which are otherwise barely available.
Author: Lian Zhang Publisher: Springer Science & Business Media ISBN: 3662098997 Category : Technology & Engineering Languages : en Pages : 148
Book Description
Two-phase microchannel cooling is one of the most promising thermal-management technologies for future high-power IC chips. Understanding the boiling process and the two-phase-flow behavior in microchannels is the key to successful implementation of a microchannel heat sink. This book focuses on the phase-change phenomena and the heat transfer in sub-150 nm diameter silicon microchannels, with emphasis on thermal measurement and modeling, and the impact of small dimensions on two-phase flow regimes.
Author: Publisher: ISBN: Category : Languages : en Pages : 17
Book Description
Microchannel heatsinks represent a highly efficient and compact method for heat removal in high heat flux components. Excellent thermal performance of a silicon microchannel heatsink has been demonstrated using liquid nitrogen as the coolant. For the heating of a 1 square centimeter area, at a heat dissipation of 500 W, a typical silicon heatsink cooled by liquid nitrogen has a thermal resistance of 0.046 cm2°K/W. The actual heatsink structure in this case is only 0.1 cm high. Silicon, although it has excellent thermal properties at liquid nitrogen temperatures, may fracture with very little plastic deformation due to mechanical and thermal stresses. Because the fracture strength of silicon depends on the presence of small defects, strength of the heatsink structures must be addressed to insure highly reliable heatsink devices. Microchannel heatsink reliability can be affected by thermal stresses that arise due to temperature gradients between the base and fin and along the film length. These stresses are combined with the bonding stresses that arise in attaching components at elevated temperatures to the silicon heatsink and then cooling the structure to the cryogenic operating temperatures. These bonding stresses are potentially large because of the differences in the values of the coefficients of thermal expansion in silicon heatsink material, and the attached component materials. The stress results are shown for a 17:1 aspect ratio heatsink cooled in liquid nitrogen. The temperature gradients are a result of a surface heat flux of 1.3 kW/cm2, approximating the heat dissipation of an RF power chip. The chip is connected to an aluminum nitride substrate, then the chip and substrate module are attached to the heatsink at a bonding temperature of 600°K, as for a gold tin eutectic bond. The stresses are shown to be within the allowables of the materials involved.
Author: Adrian Bejan Publisher: Cambridge University Press ISBN: 9780521793889 Category : Science Languages : en Pages : 370
Book Description
Seemingly universal geometric forms unite the flow systems of engineering and nature. For example, tree-shaped flows can be seen in computers, lungs, dendritic crystals, urban street patterns, and communication links. In this groundbreaking book, Adrian Bejan considers the design and optimization of engineered systems and discovers a deterministic principle of the generation of geometric form in natural systems. Shape and structure spring from the struggle for better performance in both engineering and nature. This idea is the basis of the new constructal theory: the objective and constraints principle used in engineering is the same mechanism from which the geometry in natural flow systems emerges. From heat exchangers to river channels, the book draws many parallels between the engineered and the natural world. Among the topics covered are mechanical structure, thermal structure, heat trees, ducts and rivers, turbulent structure, and structure in transportation and economics. The numerous illustrations, examples, and homework problems in every chapter make this an ideal text for engineering design courses. Its provocative ideas will also appeal to a broad range of readers in engineering, natural sciences, economics, and business.
Author: Lian Zhang
Author: Lian Zhang
Author: Lian Zhang
Author: Lian Zhang
Author: Dario Bogojević
Author: Dario Bogojević
Author: Jose Raul Rujano Maldonado
Author: Ayman Megahed
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Author: 
Author: Adrian Bejan