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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

PRESSURE RECOVERY IN CYLINDRICAL CONDENSERS

Get access (open in a dialog) DOI: 10.1615/IHTC8.170
pages 1701-1706

Résumé

Laminar pressure recovery in the condenser of a cylindrical heat pipe is analyzed up to high radial Reynolds numbers and Mach numbers. The analysis is based on the boundary layer approximation. The velocity profile is described by a non-continuous power series of the radial coordinate. Good numerical accuracy and very small computation times are obtained, even under conditions of strong flow reversal, by choosing the right terms in the series. A comparison between theory and measurements indicates that transition to turbulent flow in the condenser begins when the absolute value of the radial Reynolds number exceeds 6. The corresponding axial Reynolds number at this point is an order of magnitude lower than that for transition in adiabatic pipe flow. Backf low at the wall occurs for laminar and transitional flows. Turbulence tends to eliminate flow reversal and to decrease pressure recovery.