Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 10, Problem 10.11P
To determine
The tube surface temperature immediately after installation and prolonged service.
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Which boiling mechanism is characterized by a drop in heat transfer with
respect to the increase in temperature difference between the heated surface
and the fluid?
A. Pre-boiling
B. Nucleate boiling
C. Transition boiling
D. Film boiling
Water is to be boiled at atmospheric pressure in a polished copper pan placed on top of a
heating unit. The diameter of the bottom of the pan is 00.2 m. If during 30 minutes the water
level is dropped by 0.1 m, calculate the inner surface of the bottom of the pan.
Assumptions 1 Steady operating conditions exist. 2 Heat losses from the heater and the pan
are negligible 3 The boiling regime is nucleate boiling.
Note. Write your answer step by step and clearly explain your work. You need to upload a
file.
a) the local film condensation heat-transfer coefficient at the bottom of the tube
b) the average condensation heat-transfer coefficient over the entire length of the tube
c) the total condensation rate at the tube surface.
Chapter 10 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 10 - Show that, for water at 1-atm pressure with...Ch. 10 - The surface of a horizontal. 7-mm-diameter...Ch. 10 - The role of surface tension in bubble formation...Ch. 10 - Estimate the heat transfer coefficient, h,...Ch. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - Calculate the critical heat flux on a large...Ch. 10 - Prob. 10.11P
Ch. 10 - Prob. 10.12PCh. 10 - Prob. 10.13PCh. 10 - Prob. 10.15PCh. 10 - Prob. 10.16PCh. 10 - Consider a gas-fired boiler in which five coiled,...Ch. 10 - Prob. 10.18PCh. 10 - Prob. 10.19PCh. 10 - Prob. 10.20PCh. 10 - Prob. 10.22PCh. 10 - Prob. 10.24PCh. 10 - Prob. 10.25PCh. 10 - A small copper sphere, initially at a uniform,...Ch. 10 - Prob. 10.28PCh. 10 - A disk-shaped turbine rotor is heat-treated by...Ch. 10 - A steel bar, 20 mm in diameter and 200 mm long,...Ch. 10 - Electrical current passes through a horizontal....Ch. 10 - Consider a horizontal. D=1 -mm-diameter platinum...Ch. 10 - Prob. 10.34PCh. 10 - Prob. 10.35PCh. 10 - Prob. 10.36PCh. 10 - Prob. 10.37PCh. 10 - A polished copper sphere of 10-mm diameter,...Ch. 10 - Prob. 10.39PCh. 10 - Prob. 10.40PCh. 10 - Consider refrigerant R-134a flowing in a smooth,...Ch. 10 - Determine the tube diameter associated with p=1...Ch. 10 - Saturated steam at 0.1 bar condenses with a...Ch. 10 - Prob. 10.45PCh. 10 - Prob. 10.46PCh. 10 - Prob. 10.47PCh. 10 - Prob. 10.48PCh. 10 - Prob. 10.50PCh. 10 - Prob. 10.53PCh. 10 - The condenser of a steam power plant consists of...Ch. 10 - Prob. 10.56PCh. 10 - Prob. 10.61PCh. 10 - Prob. 10.62PCh. 10 - A technique for cooling a multichip module...Ch. 10 - Determine the rate of condensation on a 100-mm...Ch. 10 - Prob. 10.66PCh. 10 - Prob. 10.67PCh. 10 - Prob. 10.70PCh. 10 - Prob. 10.71PCh. 10 - Prob. 10.74PCh. 10 - Prob. 10.75PCh. 10 - A thin-walled cylindrical container of diameter D...
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- 5 (a) (i) State two ways in which evaporation is different from boiling. (ii) Give one example of a change of state which does not invalve boiling orevaporation. (b) The graph in Fig. 5.1 shows the variation of temperature with time for a substance that is initially liquid. temperature Eime Fig. 5.1 O State what is taking place at points A, B and C. You should say what changes of state, if any, are taking place. point A point B point C (0 Suggest why the graph is steeper at point C than at point A.arrow_forwardA Horizontal Return Fire-Tube Boiler in 60 inches in diameter, 16 ft long, has 70 tubes that are 3 inches O.D with 0.109-inch tube thickness. If was found that the boiler’s steam rate is 0.50 kg/s and the factor of evaporation is 1.25. What is the Percent (%) Rating of the Boiler?arrow_forwardEstimate the power required to boil the water in a copper pan (Cs,f = 0.013 and n = 1), 180 mm in diameter. The bottom of the pan is maintained at 115 ℃ by the heating element of an electric range. Properties of Water (1 atm): Tsat = 100℃, ρl = 957.9 kg/m3, ρv = 0.5955 kg/m3, Cpl = 4217 J/kg.K, μl = 279*10^-6 N.s/m2, Prl = 1.76, hfg = 2257 kJ/kg, σ = 58.9*10^-3 N/m. Select one: a. 16420 W b. 18166 W c. 16240 W d. 11760 Warrow_forward
- *14. ao Two pots are identical except that the flat bottom of one is alu- minum, whereas that of the other is copper. Water in these pots is boiling away at 100.0 °C at the same rate. The temperature of the heating element on which the aluminum bottom is sitting is 155.0 °C. Assume that heat enters the water only through the bottoms of the pots and find the temper- ature of the heating element on which the copper bottom rests.arrow_forwardAnalyze the condensation process using both chillers. Provide operating temperatures and pressures entering each component shown in the diagram (at points 1, 2, 3, 4). Indicate which chiller should be chosen based on the economicsarrow_forwardThe evaporator design temperature may in some cases operate at a slightly ____(higher or lower) pressure and temperature on high-efficiency equipment because the evaporator is larger.arrow_forward
- 3. With the increase in pressure: (a) Boiling point of choose the water increases correct answer and the enthalpy of evaporation increases (b) Boiling point of water increases and the enthalpy of evaporation decreases (c) Boiling point of water decreases and the enthalpy of evaporation increasesarrow_forwardAS& Heat Transfer in Steam Heater Water at an average of 70°F is fiowing in a 2-in. steel pipe, schedule 40. Steam at 220°F is condensing on the outside of the pipe. The con vective coefficient for the water inside the pipe is A = 500 btu/h ft2.°F and the con- densing steam cocfficient on the outside is h = 1500 (a) Calculate the heat loss per unit length of1 ft of pipe using resistances. (b) Repcat, using the overall based on the inside area Ap (c) Repeat, using U 13.2- Ans. (a)q= 26 710 btu/h (7.828 kW). (b) Uj = 329.1 btu/h-ft2."F (1869 W/m2. K), (c) U.= 286.4 btu/h ft2.°F (1626 W/m2. K)arrow_forwardOne of the ways to keep a pipe warm is by means of a steam tracer, through which an electrical resistance is used around the pipe and in a helical shape throughout its diameter?arrow_forward
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