Aflat plate maintained at a temperature of 80°c experiences a flow of atmospheric air at 0°c. if the temperature gradient at the plate’s surface at a given downstream-stream location is 43°c/mm, what is the local heat transfer coefficient?

h =12.9 w/m2 k

Explanation:

we know that thermal conductivity of air K at 0 degree celcius = 0.024 w/mk

T_S = 80 Degree celcius

temperature gradient = -43 degree C/mm = - 43*1000 / m

by fourier law

q = 1032 watt/m2

we know that from newton's law

q = h (T_s - T_∞)

1032 = h*(80 - 0)

h =12.9 w/m2 k

double the distance = divide strength by 4