This paper begins with a review of the author's personal experience in the research field of computer cooling. It highlights the need to develop foresight on the possible course of hardware development in order to provide the package designer with appropriate heat-transfer data in a timely manner. A question is the raised about the immediate future of the (indirect) water-cooling technology. Water-cooling has so far proven effective in cooling high-end computers which use ECL devices in two-dimensional packaging. The drive toward higher raw speeds of ECL devices, however, is going to lose steam-emerging instead is the endeavour to upgrade system performance by massively-parallel computing which requires wiring-intensive hardware.
Three-dimensional packaging will meet the demand for short global wiring
systems, but will become a commercial reality only after the establishment
of methodologies for its design and assembling. One of the key issues in
the design of 3-D computers is heat-transfer paths. Intimate coupling of
wiring and heat-transfer designs pose challenges to heat-transfer researchers
that have not surfaced in other industrial applications. Items of primary
importance include: the methodology to predict flow and temperature distributions
in a filed having a wide spectrum of length scales, the local heat-transfer
coefficients in the maze of microscale coolant channels, the possibly large
effect of extraneous factors such as irregular geometric features of coolant
channels and conjugate mode of heat transfer, and temperature control during
assembling of 3-D structures.
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