Fundamentals of Heat and Mass Transfer Seventh Edition Problem – 1.21

You’ve experienced convection cooling if you’ve ever extended your hand out the window of a moving vehicle or into a flowing water stream. With the surface of your hand at a temperature of 30 °C. determine the convection heat flux for a vehicle speed of 35 km/h in air at -5 °C with a convection…

A glass window of width W= 1 m and height H = 2 m is 5 mm thick and has a thermal conductivity of kg 1.4 W/m·K. If the inner and outer surface temperatures of the glass are 15°C and -20°C, respectively, on a cold winter day, what is the rate of heat loss through…

Consider the geometry of Problem 2.14 for the case where the thermal conductivity varies with temperature as k = ko + aT. where ko = 10W/m-K, a =-10-3 W/m-K2, and T is in kelvins. The gradient at surface B is partial differential T/partial differential x = 30 K/m. What is partial differential T/partial differential y at…

All sample problems and notes are based on the following textbook: Fundamentals of Heat and Mass Transfer Seventh Edition ISBN-13: 9780470501979 ISBN-10: 0470501979 Edition: 7 Author: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt Publication date: 2011 Publisher: Wiley Format: Hardcover 1072 pages How useful was this post? Click on a star to rate it! Submit Rating Average rating 0 /…

The free convection heat transfer coefficient on a thin hot vertical plate suspended in still air can be determined from observations of the change in plate temperature with time as it cools. Assuming the plate is isothermal and radiation exchange with its surroundings is negligible, evaluate the convection coefficient at the instant of time when…

A square isothermal chip is of width w = 5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of a coolant at T_infinity = I5 °C. From reliability considerations, the chip temperature must not…