Problem

Calculate the numerical value of each of the dimensionless parameters listed in the table....

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
(b)	Water: Effect of surface tension	Weber number, We
(c)	Wind making a wire “sing”	Strouhal number, St

Properties and definitions for this problem:

Property	Symbol	Units	Air	Water
Density	P	slugs/ft3	0.002378	1.94
Heat transfer coefficient	h	W/(m2 °C)	20	----
Thermal conductivity	k	W/(m K)	0.025	0.7
Surface tension	σ	dynes/cm	----	70

Property	Symbol	Units	Value
Plate length	L	ft	2
Depth of water film	d	cm	3
Water speed	vw	cm/s	210
Air speed	va	mph	60
Oscillation frequency	ω	Hz (or cycles/s)	140
Wire diameter	Dwire	mm	20

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