Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 10, Problem 10.8P
The heat transfer coefficient of a copper tube (1.9-cm II) and 2.3-em OD) is
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Determine the overall heat transfer coefficient
based on the outer area of a 3.81 cm O.D and
3.175 cm I.D brass tube (thermal conductivity
= 103.8 W/mk) if the heat transfer coefficients
for flow inside and outside the tube are 2270
and 2840 W/m2 k respectively. The unit
fouling resistances at inside and outside
surfaces are R = R, = 8.8 x 103 m2 KW.
can you please please work it all out
Chapter 10 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 10 -
10.1 In a heat exchanger, as shown in the...Ch. 10 - Prob. 10.2PCh. 10 -
10.3 A light oil flows through a copper tube of...Ch. 10 - Prob. 10.4PCh. 10 - Water flowing in a long, aluminum lube is to be...Ch. 10 - Mot water is used to heat air in a double-pipe...Ch. 10 - Prob. 10.7PCh. 10 -
10.8 The heat transfer coefficient of a copper...
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- Determine the rate of heat transfer per meter length to a light oil flowing through a 2.5-cm-ID, 60-cm-long copper tube at a velocity of 0.03 m/s. The oil enters the tube at 16C, and the tube is heated by steam condensing on its outer surface at atmospheric pressure with a heat transfer coefficient of 11.3 kW/m K. The properties of the oil at various temperatures are listed in the following table: Temperature, T(C) 15 30 40 65 100 (kg/m3) 912 912 896 880 864 c(kJ/kgK) 1.80 1.84 1.925 2.0 2.135 k(W/mK) 0.133 0.133 0.131 0.129 0.128 (kg/ms) 0.089 0.0414 0.023 0.00786 0.0033 Pr 1204 573 338 122 55arrow_forwardCalculate the overall heat transfer coefficient for the following cases: (a) Heat is transferred across Im?of a 3-cm thick plate made of steel of k = 36.4 W/ (m-K). A liquid flows on one side with a heat transfer coefficient h, = 4000 W/ (m2K) and the other side is exposed to air with hy= 12W/(m²-K). Assume a foul- ing heat transfer coefficient of h,- 3000 W/(m-K) on the liquid side. (b) Same as part (a), with the air replaced by condensing steam, h, = 6000 W/(m2K). () Same as part (a) with the liquid replaced by a flowing gas, h = 6 W/(m2K). %3D %3Darrow_forwardExample 2 To increase the heat dissipation from a 2.5 cm OD tube, circumferential fins made of aluminum (k = 200 W/m K) are soldered to the outer surface. The fins are 0.1 cm thick and have an outer diameter of 5.5 cm. If the tube temperature is 100°C, the environmental temperature is 25°C, and the heat transfer coefficient between the fin and the environment is 65 W/m2 K, calculate the rate of heat loss from two fins.arrow_forward
- manufacturer plans to use steel wire (ks = 25 Wm-1 K-1 ) in a household appliance. For safetyconsiderations, we would like an estimate of the smallest electric current that is required to melt the wire.The bare wire is exposed to 20°C air with convective heat transfer coefficient of 15 Wm-2 K-1 and hasdiameter of 2.0 mm and electrical resistance of 0.20 W/m (i.e., per meter of wire). Thermal energy isproduced within the wire at the rate I2 Re , where I is the electrical current through the wire and Re is thewire’s electrical resistance. I = 0.643 Solve the microscopic energy balance in the steel wire with a prescribed temperature Ts at the wiresurface, as well as the requirement that temperature be finite at the center of the wire, to find anexpression for the temperature at the center of the wire in terms of the surface temperature Ts . Use yourresult to estimate the electric current at which the wire begins to melt.arrow_forwardWhat is true answerarrow_forward8--The reactor from uniform carbide and graphite as a cylinder rod with diameter of 12 mm. The volumetric heat liberationis 3.88x108 W/m3 The thermal conductivity of the rod material is 85 W/mC.. Determine the heat losses from the rod and the surface temperature if the maximum temperature of the rod is 200C...Ans Tw=1940 C,,Heat losses=1.164 MW/m2.arrow_forward
- A spherical shaped vessel of 1.4 m diameter is 90 mm thick. Find the rate of heat leakage, if the temperature difference between the inner and outer surfaces is 220oC. Thermal conductivity of the material of the sphere is 0.083 W/m-K.arrow_forwardQ.arrow_forwardA bar with surface temperature (310) oC and diameter (9.5) mm, temperature 20oC and heat convectionIt is contained in a fluid with a coefficient of 95 W / m2K. The top of this bar is heat conductionIt is desired to be coated with bakelite with a coefficient of 2.5 W / mK up to the critical radius thickness.a) the critical radius of the bakelite coating and the heat transfer at the critical radius per unit length.Found it. b) heat transitions per unit length for uninsulated and bakelite (insulation) coated rodYou calculate. Comment the resultsarrow_forward
- Determine the heat transferred through the composite wall shown in the figure and the overall heat transfer coefficient. Take the following information: Thermal conductivity as k,-30,k,=10,k=6.67,ka=20,and k=30 W/m.K. La=L=L=L«=L=lm. Take of area of A,-A¸ =1m² and A,-A,=0.4 m² and A-0.2 m². The left side: T =800 °C;h, = 150 W/m².K The right : T =35 °C; h, = 250 W / m'.K b a e h, d L,=L-Ld Le Laarrow_forwardOne side of a copper (401 W/m-oC) block 5 cm thick is maintained at 175 oC, the other side is covered with fiberglass (k = 0.026 W/m-0C) 2.5 cm thick. The outside of the block is maintained at 38 oC, and the total heat flow is 44 kW. Find the overall heat transfer coefficient. (four decimal places for final answer)arrow_forwardI need the answer as soon as possiblearrow_forward
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