To warm up a glass of milk initially at 3 C, a mother places the glass in a large pan filled up with water at 70 C. The glass is thin-walled, d=6 cm. The height of the milk in the glass is H=7 cm. Assume that the milk is stirred often enough so that its temperature is nearly uniform. The heat transfer coefficient between the milk and the glass is h=120 W/m2-K. Determine the time needed to warm up the milk from 3 C to 38 C

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