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Abstract:

In the paper two models of heat transfer through the main parts of the test section with a narrow channel, were proposed and discussed: one- and two-dimensional. The area of interest was the issue of heat transfer into refrigerant 123 flowing through a narrow vertical channel of 1 mm height with one wall heated uniformly and others approximately adiabatic. Experimental investigations dealt with forced convection and particular attention was paid to boiling incipience conditions and hysteresis phenomena. Thermosensivite liquid crystals were used for measuring the two-dimensional temperature distribution on the heating surface. An inverse problem was dealt with as, on the basis of temperature measurement on external side of the heating and the measurement of the electric power supplied to the heater, it is possible to determine local heat transfer coefficients on the surface: the heating foil - the boiling fluid flowing along the narrow channel. The resultant local heat transfer coefficients obtained for two models were compared.

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Determination of local flow boiling heat transfer coefficient in narrow channel