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A light motor oil is to be heated in a 1/4-in Schedule 40 steel pipe 15 ft long having a surface temperature of 350F (pipe
A light motor oil is to be heated in a 1/4-in Schedule 40 steel pipe 15 ft long having a surface temperature of 350F (pipe wall temperature). The oil is to be heated from 150 to 250F. The oil characteristics are given below. Assume the flow is laminarand the Graetz number is large enough for the final equation for laminar flow heat transfer to apply. a)Calculate the correction factor (ov) that accounts for the difference between heating and cooling. b)Find the mass flow rate of oil (m) that can be heated in this pipe (lb/hr). Check next slide. c)What heatcoefficient can be expected (Btu/ft.h.F)? d)Calculate the Re number to check the validity of a laminar flow assumption. 0.082 Thermal conductivity (Btu/ft.h.F) Specific Heat (Btu/lb.F) Temperature (F) 0.48 Viscosity (CP) 6.0 150 250 3.3 350 1.37
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