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A steel heat exchanger tube of 2 cm outer diameter is fitted with a steel spiral annular fin of 4 cm outer diameter, thickness 0.4 mm, and wound at a pitch of 3 mm. If the outside heat transfer coefficient is 20 W / m^2 K on the original bare tube and 15 W / m^2 K on the finned tube, determine the reduction in the outside thermal resistance achieved by adding the fins. Take ksteel =42 W / m K. | Numerade

A steel heat exchanger tube of 2 cm outer diameter is fitted with a steel spiral annular fin of 4 cm outer diameter, thickness 0.4 mm, and wound at a pitch of 3 mm. If the outside heat transfer coefficient is 20 W / m^2 K on the original bare tube and 15 W / m^2 K on the finned tube, determine the reduction in the outside thermal resistance achieved by adding the fins. Take ksteel =42 W / m K. | Numerade

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PPT - Heat Transfer from Extended Surfaces PowerPoint Presentation, free download - ID:5598593

PPT - Heat Transfer from Extended Surfaces PowerPoint Presentation, free download - ID:5598593

2014年10月28日

SOLVED: A rectangular fin (thickness of 10 mm and width of 20 mm) is used to remove heat from a surface at a temperature of 150Â°C. The ambient air has a temperature of 30Â°C and a heat transfer coefficient of 20 W/mK.1. If the thermal conductivity is 10 W/mK, check if extended surface analysis can be applied.2. Find the minimum length of the fin in order to apply the infinite fin case analysis.3. Find the fin heat transfer rate and the fin effectiveness.4. If the thermal conductivity of the fin

SOLVED: A rectangular fin (thickness of 10 mm and width of 20 mm) is used to remove heat from a surface at a temperature of 150Â°C. The ambient air has a temperature of 30Â°C and a heat transfer coefficient of 20 W/mK.1. If the thermal conductivity is 10 W/mK, check if extended surface analysis can be applied.2. Find the minimum length of the fin in order to apply the infinite fin case analysis.3. Find the fin heat transfer rate and the fin effectiveness.4. If the thermal conductivity of the fin

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PPT - Heat Transfer Correlations for Internal Flow PowerPoint Presentation - ID:6216405

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5.16 The surface temperature of a tube ofradius Ri is Ti. The tube is cooledwith a porous annular fin of porosityP, inner radius Ri and outerradius Ro. Coolant at a mass flow rateṁ and temperature T∞ flows axiallynormal to the fin surface. The specificheat of the coolant is cpf and theconductivity of the solid-fluid matrixis k. The fin exchanges heat byconvection along its upper and lowersurfaces. The heat transfer coefficient1825 Conduction in Porous Mediais h and the ambient temperature is T∞.

5.16 The surface temperature of a tube ofradius Ri is Ti. The tube is cooledwith a porous annular fin of porosityP, inner radius Ri and outerradius Ro. Coolant at a mass flow rateṁ and temperature T∞ flows axiallynormal to the fin surface. The specificheat of the coolant is cpf and theconductivity of the solid-fluid matrixis k. The fin exchanges heat byconvection along its upper and lowersurfaces. The heat transfer coefficient1825 Conduction in Porous Mediais h and the ambient temperature is T∞.

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