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pressure drop

pressure drop

pressure drop

(OP)
I have a aluminum chassis. 7" long by 4" wide by 1.2" high. The thickness of the aluminum is .1 inches.

There is air introduced in the opening of the chassis is from of an air inlet at a velocity of .61ft/sec. the air area of the inlet is .00274 ft^2.

Inside the chassis is a pcb and heat sink all of that is 1 inch thick. The width is 3.8 inches and it's 6.8 inches long.

Can I get some help on calculating the pressure drop after inside the aluminum chassis please?

RE: pressure drop

It would appear that you will have mostly pressure drop from increased velocity (Bernoulli effect) as the flow moves through restricted spaces, rather than friction from flow against the edge surfaces.  The flowrate is low and the length is very short, so if there was a friction component, I would expect the total friction down the length would hardly be noticable.  Sketch out some streamlines of how you think the fluid moves through the path and use the "average" crossectional area of the most continuous streams to calculate, or rather estimate, the velocity increase.  From that you can determine an estimated theoretical pressure drop through the restricted areas.

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