Experimental study of heat transfer, pressure drop, and dryout for flow boiling of water in an oil heated minichannel
Abstract
Heat transfer and pressure drop, are experimentally
recorded for flow boiling water in a single 706 mm circular
copper channel 158.75 mm long. Heat is supplied by heat
transfer oil at specified temperatures to a helical channel in
the test section. In contrast to other current experimental
techniques for flow boiling in small diameter tubes, a
uniform temperature boundary condition is employed rather
than a constant heat flux condition.
The principal results of these experiments are twophase
flow boiling heat transfer rates and an analysis of the
time-dependent pressure drop signature during two-phase
flow in a minichannel. The range of experiments includes
mass fluxes of 43.8-3070 kg/m2s and wall temperatures of
100°C-171.2°C. In all cases the test section water inlet is
subcooled to between 72.9°C and 99.6°C. The inlet
pressures used are 1.1-230.5 kPa (gage).
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