Abstract:
During last twenty years, component density on integrated circuits has grown from
about six thousand transistors on the Intel 8080 microprocessor to over five million
transistors on a similar-sized Intel P6 microprocessor. Power and component densities
on these integrated circuits have required the development of innovative cooling
methods. Miniature heat pipes (MHPs) appear promising for use in microelectronics
cooling. An experimental study has been performed to understand the heat transfer
performance of Miniature Heat Pipes (L=150 mm) having diameter of 3,5 and 6 mm,
which can be applied for cooling solution of electronics equipment such as the
notebook PC, CPU etc. The experimental parameters are inclination, diameter of the
heat pipe, coolant flow rate and working fluid. Taking ethanol, methanol, acetone as
working fluid, heat transfer characteristics are determined experimentally for all
diameter tubes, based on the principle of phase change at different inclination angle
and different flow rate of water coolant. An analysis of the experimental data gives
the following findings: The wall surface temperature of heating section decreases with
increase of inclination of MHP. There is no significant effect of inclination angle on
thermal resistance and overall heat transfer coefficient. The heat transfer rate
increases with the increase of diameter and input power. Overall heat transfer
coefficient of the MHP is found to be maximum for ethanol working fluid.
