Design and Fabrication of Micro-Channel Heat Sinks

Additive of surfactant leads to enhancement of heat transfer compared to water boiling in the same gap size however, this effect decreases with decreasing channel size. For the same gap size CHF in surfactant solutions is significantly lower than that in water. At high values of heat flux some foaming patches began to occur this process increased with decrease in gap size and led to decrease in CHF, Hetsroni et al. (2007). 

6 Design and Fabrication of Micro-Channel Heat Sinks 

The design question is given the heat rate Q, the length L, and width W, select a working fluid with mass flow rate m, channel dimension d, channel spacing Sxd (for 5 is a number 1), number of channels n, and material and thickness of the block H. We will be particularly interested in the pumping power P. 

The width and thickness of the block, and the number, length, diameter, and spacing of the channels are not independent. The geometric configuration requires that the number of channels in a row, be 

The total number of holes in a cross-section, which is the number of channels, is 

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We attempt here to describe the fundamental equations of fluid mechanics and heat transfer. The main emphasis, however, is on understanding the physical principles and on application of the theory to realistic problems. The state of the art in high-heat flux management schemes, pressure and temperature measurement, pressure drop and heat transfer in single-phase and two-phase micro-channels, design and fabrication of micro-channel heat sinks are discussed. 

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