Entrance heat transfer correlation for air cooling of arrays of rectangular blocks

Document Type

Conference Proceeding

Date of Original Version



Experiments were conducted to determine heat transfer coefficient in the entrance region of regular in-line arrays of rectangular blocks in forced air cooling. The module-averaged heat transfer coefficient in the entrance region is usually high and falls off to periodic fully developed values by the third or fourth row of the array. Heat transfer coefficient was found to be correlated well in terms of a composite geometric parameter called the volume packing density, Reynolds number and the non-dimensional entry length. The correlations for the fully developed regime have already been developed by the authors. With the availability of entrance correlation, the overall heat transfer can now be conveniently formulated. This will enable the development of a superior predictive model for cooling of electronic components. This is a further step to more accurate prediction of temperature of electronic circuit boards.

Publication Title

American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD



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