Amodel centrifugal fan is tested to deliver 500 cfm of air at standard condition with a pressure rise of 2 in. of water at a speed of 1800 rpm. while the prototype fan will produce the same pressure at 1200 rpm, determine the diameter ratio and the flow rate of the prototype fan

Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k