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AIR ENTER A 5-M-LONG SECTION OF A RECTANGULAR DUCT OF CROSS SECTION 12*18 CM MADE OF...

AIR ENTER A 5-M-LONG SECTION OF A RECTANGULAR DUCT OF CROSS SECTION 12*18 CM MADE OF COMMERCIAL STEEL AT 1 ATM AND 35ºc AT AN AVERAGE VEL OF 6M/S. DISGREGARDING THE ENTRANCE EFFECTS, DETERMINE THE FAN POWER NEEDED TO OVERCOME THE PRESSURE LOSSES IN THIS SECTION OF THE DUCT.

THE PROBLEM IS VERY SIMILAR IN THE CHAP 8 PROB 43 OF THE CENGEL MECHANIC OF FLUIDS 3RD ED. I JUST WANT TO KNOW THE RESULT WITH MY DATES AND HOW to get the "f" in THE STEP OF THE FRICTION FACTOR, i mean that specific step solved step by step

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