10-3C
What is the difference between evaporation and boiling?
10-4C
What is the difference between pool boiling and flow boiling?
10-7C Draw the boiling curve and identify the burnout point on the curve. Explain
how burnout is caused. Why is the burnout p

2.35 Derive the heat diffusion equation for cylindrical coordinates beginning with the differential control
volume shown in Figure 2.9.
2.36 Derive the heat diffusion equation for spherical coordinates beginning with the differential control volume
shown

(b) Assuming that the surface flux qs and the inlet mean temperature Tm,1 are
identical
for both cases, will the exit mean temperature Tm,2 for case A be greater than, equal to, or
less than Tm,2 for case B? Briefly explain why.

ill47 A double-pipe parallel-ow heat exchanger is to heat
water (cp = 4180 J/kg'K) from 25C to 60C at a rate of 0.2 kg/s.
The heating is to be accomplished by geothermal water (q19 =
4310 J/kg-K) available at 140C at a mass ow rate of 0.3 kg/s.
The inner

datermme the temperames-I at the m
medium. Hint: Take advantage of symmetry. _. '
Answers: T1 = T4 = 93(31 T2 = T3 = 86C . 5-55 Two long solid bodies are mbjected to steady two-dimensimnl heat transfer. The unknown nods] tenqmenlmes are to be
determnled.

-_ For laminar free convection from a heated v
'3 surface, the local convection coefficient may be-
pressed as h = Cxm, where h is the coefficien;
PROBLEM 6.2
KNOWN: Variation of local convection coefcient with x for 'ee convection from a vertical
h

The vertical rear window of an automobile
9.15 thickness L = 8 mm and height H: 0.5 1111 audio:
cfw_ains ne- meshed heating wires that can induce
neay uniform volumetric heating,q (W/m3 )
(:1) Consider steady state conditions for which the
interior surfac