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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

VAPOR FLOW REVERSAL IN THE CONDENSATION ZONE OF A SIMULATED FLAT-PLATE HEAT PIPE

Get access (open in a dialog) DOI: 10.1615/IHTC7.2330
pages 331-335

Abstract

Recent vapor flow computations have indicated the possibility of flow reversal in the condensation zone of heat pipes. A vapor flow model consisting of a parallel plate channel with porous walls has been constructed. The evaporation and condensation processes were simulated by means of air injection and suction through the porous walls.
Pressure profiles along the vapor channel have been measured. In the condenser the predicted pressure buildup for values of the radial Reynolds number Rer >5 was found. Velocity profiles in the condenser were measured with Laser Doppler Velocimetry using photon correlation techniques.
For asymmetrical flow, with injection and suction through the bottom plate only, flow reversal along the top plate was measured in the far end of the condenser for Rer ≥15 as expected from the computer calculations.
In the case that a non-condensable gas is present in the condenser, as is the case for variable conductance heat pipes, the existance of a zone of recirculating flow will strongly influence the condensation process.