Consider the velocity and temperature profiles for air- flow in a tube with diameter of 8 cm can be expressed as 11(r) = 0.21(1-(r/r)21 tr) = 250 + 200( r/r)3 with units in m/s and k, respectively. if the convection heat transfer coefficient is 100 w/m2.k, determine the mass flow rate and surface heat flux using the given velocity and tem- perature profiles. evaluate the air properties at 20°c and 1 atm. properties the density of 1 atm air at 20°c is p-1.204 kg/m

Determine whether or not it is possible to compress air adiabatically from k to 140 kpa and 400 k. what is the entropy change during this process?

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

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