Publikacje

Abstract:

The article presents experimental results of boiling heat transfer during FC-770 flow in a group of five minichannels with
a common heated wall. The flow orientation was changed from 0º to 180º, with a 15° increment. During the experiments,
the temperature of its outer heated wall surface was measured by an infrared camera. At the same time, flow patterns were
captured through the glass plate opposite the heated wall using a high-speed camera. The purpose of the calculations was
to determine local heat transfer coefficients on the contact surface between the working fluid and the heated surface in the
central minichannel, using a simplified 1D calculation method. The results in the form of dependences of the temperature
of the heated wall and the heat transfer coefficient as a function of the distance from the channel inlet for various flow
orientations were analysed. Furthermore, typical boiling curves and two-phase flow patterns were presented. The mean
relative error of the heat transfer coefficient was determined for various flow orientation. The dependence of the void
fraction as a function of heat flux was illustrated for various angles of minichannel inclination to the horizontal plane. It
was observed that the void fraction increased with heat flux and with increasing angle of inclination of the minichannel to
the horizontal plane.

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Effect of flow orientation in experimental studies on FC-770 boiling heat transfer in asymmetrically heated minichannels