Answered: Liquid film of thickness h Block…

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter35: Comfort And Psychrometrics

Section: Chapter Questions

Problem 6RQ: Name the two unknowns that are easiest to obtain for making plots on the psychrometric chart.

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Question

A block of weight W slides down an inclined plane while
lubricated by a thin fi lm of oil, as in Fig. P1.45. The fi lm
contact area is A and its thickness is h . Assuming a linear
velocity distribution in the fi lm, derive an expression for
the “terminal” (zero-acceleration) velocity V of the block.
Find the terminal velocity of the block if the block mass is
6 kg, A = 35 cm ² , θ = 15 ° , and the fi lm is 1-mm-thick SAE
30 oil at 20 ° C.

Liquid film of
thickness h
Block contact
aгea A

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