Experimental study on mixed convection heat transfer for thermally developing flow in horizontal ducts with radiation effects
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This research focuses on the interaction of surface radiation with laminar mixed convection heat transfer for thermally developing airflow in horizontal ducts. The duct cross section is made of two differentially heated isothermal vertical walls and two adiabatic horizontal walls. In a series of experiments, the Reynolds number is varied from about Re = 800 to Re = 1200, for two aspect ratios of the duct cross section. The hot wall temperature ranges from 27°C to 100°C, and the emissivity of internal walls are 0.05 and 0.85. The total heat transfer from the hot wall to the cold wall of the duct depends on the mixed convection and also on the surface radiation heat transfer that takes place within the duct. Therefore, it is important that the effects of surface radiation must be properly understood, and accounted for, in the design and analysis of flow and heat transfer through ducts. The results presented here show the effect of surface radiation and mixed convection on the total heat transfer rate within the duct. The flow field within the duct is also made visible by a suitable smoke flow visualization method.
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Rajamohan, Ganesan (2012)Mixed convection heat transfer in horizontal and vertical ducts with flow through the duct plays an important role in the design and operation of several industrial equipment involving heat transfer and fluid flow phenomena. ...
Ganesan, R.; Narayanaswamy, Ramesh; Perumal, K. (2015)In this research, experiments are performed to study the laminar flow mixed-convection heat transfer with radiation effects for a hydrodynamically fully developed and thermally developing airflow in a horizontal duct. The ...
Narayanaswamy, Ramesh; Chandratilleke, Tilak; Wangdhamkoom, Panithan (2010)A numerical analysis of heat transfer in a heated horizontal duct is carried out to study the effect of surface radiation from duct inner walls on mixed convection heat transfer. The duct is differentially heated, wherein ...