Preprint Article Version 1 This version is not peer-reviewed

Experimental Estimation of Temporal and Spatial Resolution of Coefficient of Heat Transfer in a Channel Using Inverse Heat Transfer Method

Version 1 : Received: 23 July 2019 / Approved: 24 July 2019 / Online: 24 July 2019 (04:10:31 CEST)

How to cite: Karami, M.; Davoodabadi Farahani, S.; Kowsary, F.; Mosavi, A. Experimental Estimation of Temporal and Spatial Resolution of Coefficient of Heat Transfer in a Channel Using Inverse Heat Transfer Method. Preprints 2019, 2019070264 (doi: 10.20944/preprints201907.0264.v1). Karami, M.; Davoodabadi Farahani, S.; Kowsary, F.; Mosavi, A. Experimental Estimation of Temporal and Spatial Resolution of Coefficient of Heat Transfer in a Channel Using Inverse Heat Transfer Method. Preprints 2019, 2019070264 (doi: 10.20944/preprints201907.0264.v1).

Abstract

In this research, a novel method to investigation the transient heat transfer coefficient in a channel is suggested experimentally, in which the water flow, itself, is considered both just liquid phase and liquid-vapor phase. The experiments were designed to predict the temporal and spatial resolution of Nusselt number. The inverse technique method is non-intrusive, in which time history of temperature is measured, using some thermocouples within the wall to provide input data for the inverse algorithm. The conjugate gradient method is used mostly as an inverse method. The temporal and spatial changes of heat flux, Nusselt number, vapor quality, convection number, and boiling number have all been estimated, showing that the estimated local Nusselt numbers of flow for without and with phase change are close to those predicted from the correlations of Churchill and Ozoe (1973) and Kandlikar (1990), respectively. This study suggests that the extended inverse technique can be successfully utilized to calculate the local time-dependent heat transfer coefficient of boiling flow.

Subject Areas

heat transfer; inverse method; boiling flow; local Nusselt number; time resolution

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