Chapter 9, Problem 4ICA

Calculate the numerical value of each of the dimensionless parameters listed in the table. Be sure to check that the ratio is actually dimensionless after you insert the values.

	Situation	Name	Expression	Value
(a)	Air over a flat plate	Nusselt number, Nu	$\frac{hL}{k}$
(b)	Wind making a wire “sing”	Strouhal number, St	$\frac{\omega D_{wire}}{V_a}$

Property	Symbol	Units	Value
Heat transfer coefficient	h	W/(m2 oC)	20
Thermal conductivity	k	W/(m K)	0.025
Plate length	L	ft	2
Air speed	va	mph	60
Oscillation frequency	ω	Hz or cycles/s	140
Wire diameter	Dwire	mm	20