Abstract
In this paper, we critically reconsider and discuss the models used in one of our previous work to calculate the local convective heat flux for forced air-flows inside narrow rectangular channel, in order to evaluate the limitations which may be inherent with them. To this end, several numerical FEM models have been developed in COMSOL™ and used to analyze in depth previous data processing procedures; furthermore, experimental tests are made on the channel materials, to determine their thermal conductivities and radiative properties. Here, the results of this analysis are presented and discussed.
Highlights
Forced air-flows inside narrow rectangular channels are frequently encountered in many “compact” heat transfer devices
Several numerical FEM models have been developed in COMSOLTM and used to analyze in depth previous data processing procedures; experimental tests are made on the channel materials, to determine their thermal conductivities and radiative properties
The channel is heated with two independently powered and controlled printed circuit boards (PCB), and the air flow is regulated by means of a valve system
Summary
Forced air-flows inside narrow rectangular channels are frequently encountered in many “compact” heat transfer devices. Ribs are an efficient and cost-effective way to enhance heat transfer without overmuch penalizing pressure drops For this reason, a long-term experimental campaign has been carried out at the ThermALab of Energy Department of Politecnico di Milano on heat transfer characteristics in forced convection through rectangular channels with one or two rib-roughened surfaces in a very large variety of configurations. The present work originates from our previous endeavors in measuring the local convective heat transfer coefficient in transitioning flow regimes inside a channel with only the bottom surface heated and ribbed [1]. Accurate conductive and radiative models are needed to retrieve the information on heat fluxes from local temperature measurements; on other hand, the thermophysical properties of materials should be known with the greater possible accuracy
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