Publikacje

Abstract:

This paper is focused onheat transfer and single phase flow of ethanol in an asymmetrically heated horizontal minichannel. The pre-set thermal and flow parameters (pressure and temperature at the inlet and the outlet from the minichannel, volumetric flow rate, heat flux delivered to the heater) were obtained from the dedicated measurement system. Thermograms of the heater surface and the surfacein the adiabatic part of the minichannel were obtained with
a high resolution thermal imaging camera and used to produce temperature profiles. The stationary temperature distributions in the insulating foil, heater and ethanol were described with the Laplace equation, Poisson equation and energy equation with frictional heat, respectively. Solving the differential equation system (and the specified boundary conditions) led to solving three sequential inverse problems in three adjacent regions with different physical parameters. These inverse problems were solved using the Trefftz method and the temperature of the flowing liquidwas calculated with the Picard –Trefftz method. The known distributions of the liquid and heating surface temperatures were used to determine the heat transfer coefficient across the liquid-heater interface. TheTrefftz and Picard-Trefftz methods yielded similar local values of the heat transfer coefficient and ethanol temperature distributions.

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NUMERICAL SIMULATION OF THE TEMPERATURE FIELDS IN A SINGLE-PHASE FLOW IN AN ASYMMETRICALLY HEATED MININCHANNEL