Aheating element wire is 2-m long and has a diameter of 2-mm; it is made of a material with a thermal conductivity of 10 w/m-k. under steady-state conditions it generates 1000w of heat which transfers away via convection at a rate of 150 w/m^2-k to a room at an ambient temperature of 25°c. determine the outer surface temperature of the wire in °c. present your answer in 3 significant figures.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Hydraulic fluid with a sg. of 0.78 is flowing through a 1.5 in. i.d. pipe at 58 gal/min. the fluid has an absolute viscosity of 11.8 x 105 lbf-sec/ft2. is the flow laminar, turbulent or within the critical range? give both a numerical reynolds number and a term answer.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]