- Surface Condition T Troj 4 Y T6 00 1 Tr 1 T 6 0 Turo 7111 Problem 3 30 Points 10 For Each A Water Flow Enters Th 1 (133.2 KiB) Viewed 30 times
tube (k=0.5 W/m*K) which has and inner and outer radii of 30 and
50mm. water flows through the tube at a rate of m'=0.5 kg/s and its
mean inlet and outlet temps are Ti=80C and T0=20C. what is the
length of the tube if the whole tube is in the fully developed
region.
(c) what is the average convection coefficient associated with
the water flow.
Surface condition T>Troj 4 y=- T6.00 1 Tr. 1 T 6.0) Turo) 7111 PROBLEM 3 (30 points, 10 for each) A water flow enters the circular tube (right plot) at a uniform temperature T(1,0) that is less than the surface temperature, convection heat transfer occurs and a thermal boundary layer begins to develop. (a) Please explain the requirements (criteria) to reach thermal fully developed condition for both constant surface and heat flux boundary conditions. Ice bath is covering the outer surface of a thick-walled circular Teflon tube (k = 0.5 W/ mK) which has an inner and outer radii of 30 and 50 mm. Water flows through the tube at a rate of m=0.5 kg/s, and its mean inlet and outlet temperatures are Imi = 80°C and Tmo= 20°C. (b) What is the length of the tube if the whole tube is in fully developed region? (C) what is the average convection coefficient associated with the water flow? PROPERTIES: Water (I=323K): C= 4200 J/kg-K. 14550x10 kg/s-m, k=0.64 W/m-K. Pr=3 Thermal entrance region Fully developed ropion