Local convection heat transfer coefficient for air flow- ing parallel over a 1-m-long plate with irregulär surface topology is experimentally determined to be hx = 0.5 ÷ 2x – 0.7x3, where hx is in W/m2 ·K. If the plate surface is coated with water, determine the corresponding average mass convection coefficient over the entire plate. Assume properties can be evaluated at 298 K and 1 atm.
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