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MONASH UNIVERSITY SCHOOL OF ENGINEERING (CHEMICAL ENGINEERING) CHE2163 HEAT & MASS TRANSFER Experiment H1 Extended Surface Lab INTRODUCTION One major mode of heat transfer is heat convection . It refers to heat tranfer that will occur between a surface and a moving fluid when they are at different temperatures. There are two mechanisms involved in convective heat transfer: one is due to the random molecular motion (diffusion) closed to the surface, and the other is by the bulk, or macroscopic, motion of the fluid. Convective heat transfer can be classified according to the nature of the flow. Forced convection is when the flow is caused by external means, such as by a fan, a pump, or atmospgeric winds. In contrast, free (natural) convection occurs when the flow is induced by bouyancy forces, which are due to density differences cause by temperature variations in the fluid. In this experiment, a free and forced convection apparatus is used to study the phenomena of natural and forced convection. The temperature profiles and heat flux in a rectangular air duct fitted with various heated surfaces such as vertical and horizontal plates, cylindrical pins and finned plate surface can be measured. Heat transfer coefficients are calculated, expressed in Nusselt number(Nu). Correlations of Nu with relevant dimensionless groups such as Reynolds (Re), Prandlt (Pr) and Rayleigh (Ra), etc., are presented and compared with the literature values. Each group of students will perform both free and forced convection parts of the experiment using a retangular fin. EXPERIMENTAL PROCEDURE Examine the free and forced convection apparatus (LS-17004 Lotus) carefully and identify the essential parts of the equipment. The following safety and precaution must be followed during the course of the experiment.
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