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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

ASSESSMENT OF THE COMBINED PRESSURE DROP AND HEAT TRANSFER PERFORMANCE OF A CROSS-RIBBED CHANNEL GEOMETRY IN A COMPACT EVAPORATOR COLD PLATE

Get access (open in a dialog) DOI: 10.1615/IHTC9.1010
pages 27-32

Abstract

New measurements of the two-phase pressure drop and void fraction during vertical adiabatic two-phase flow in a cross-ribbed channel are reported. Correlations for the void fraction and the two-phase multiplier associated with the frictional component of the pressure drop are developed from the data and used with a previously reported correlation for the convective boiling heat transfer coefficient in this channel geometry to assess the trade-off between pressure drop and heat transfer enhancement. Values of local and overall goodness factors are determined for this channel geometry at typical operating conditions in a compact evaporator cold plate for electronics cooling. The local goodness factor varies considerably along the passage, being high at the inlet and decreasing as the quality increases. The value of the overall goodness factors for the cross-ribbed channel were comparable to those for an offset strip finned surface, but were almost an order of magnitude lower than comparable values for a round tube. However, the average wall superheats for the cross-ribbed geometry were as much as a factor of five lower than those for round tubes under comparable conditions. The impact of these results on cold plate design is also discussed.