Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Chapter 10, Problem 10.5P
To determine
The boiling heat transfer coefficient and the value of correlation coefficient
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All properties should be evaluated at the temperature of the steam.Saturated, pure steam at 65 ºC condenses on the surface of a vertical tube with outersurface diameter 2 cm which is maintained at a uniform temperature of 35 ºC. Determinethe tube length for a condensate flow rate of 5 x 10-3 kg/s.
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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- Water at atmospheric pressure is boiled in a container using a horizontal 8 mm electric wire (ε=0.9) whose temperature is maintained by an electric current at 250oC. Estimate the boiling heat transfer coefficient between the water and the wire surface. Properties of Water, liquid: ρl = 957.9 kg/m3, hfg = 2257 kJ/kg, vapor: ρv = 4.8 kg/m3, Cp,v = 2560 J/kg.K, μv = 14.85*10-6 N.s/m2, kv=0.0331 W/mK. Select one: a. 247 W/m2K b. 440 W/m2K c. 90.7 W/m2K d. 710 W/m2Karrow_forwardThere is a long rod, insulated to avoid any heat loss on its sides, is in perfect thermal contact with the boiling water (at atm pressure) at of the one end and with the ice-water mixture. The rod has a 1.00 m section of copper (with one end in boiling water) connected and joined together end-to-end to a length, L2, of steel (with one end in the ice water). Both sections of the rod have cross-sectional areas = 4.00 cm2. The temperature of the copper-steel junction is 65.0 °C after a steady state has been met. How much heat per second flows from the boiling water to the ice-water mixture? kCopper = 380 W/m*K kStainless Steel = 50 W/m*K A. How much heat per sec (watts) flows from boiling water to ice water mixture? B. Find the length L2 of steel section in metersarrow_forwardSaturated, pure steam at a temperature of 170 oC condenses on the outer surface of a vertical tube of outer diameter 2 cm and length 1.5 m. The tube surface is maintained at a uniform temperature of 150 oC. Calculate: the local film condensation heat-transfer coefficient at the bottom of the tube. the average condensation heat-transfer coefficient over the entire length of the tube. the total condensation rate at the tube surface.arrow_forward
- 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.arrow_forwardThe condensation process of vapors on the outside of horizontal tube banks is described by the equation below, NNU = 0.725 (g p² hfg Do³) μ Δt Ν κ At 45 C R-22 properties are: Density, p Dynamic viscosity, μ Latent heat, hfg Thermal conductivity, k where N tubes/row At = hfg AT = difference between wall surface & R-22 NNu Refrigerant - 22 condenser operating at 45 C cooled with water from cooling tower entering at 30 C and leaves at 36 C. The condenser is shell-tube type with copper tubes of 14 mm ID & 16 mm OD arranged with 3 tubes per row (N). a) Compute the convective heat transfer of R-22 in W/m²K. = 1,109 kg/m³ 0.00018 Pa s 160.9 kJ/kg 0.0779 W/m K (*50-45) = 5 C (*from sample problem #2 pipe wall temperature) diff. of temp between wall & fluid latent heat of condensation generally a function of (NR₂. Npr) D/ karrow_forwardMust solve all questions.arrow_forward
- Proflem # 27. iA fillud with water to a level and is éxposed, to dng air at 30°C. 40 mm deep a pan of of 20 mm mass diffusivity fove for time' reguired evapor ate. -3 m² /. for all the water to 2.5x 10arrow_forwardi need the answer quicklyarrow_forward8.2 From its definition and from the property values in Appendix 2, Table 13, calculate the coefficient of thermal expansion, , for saturated water at 403 K. Then compare your results with the value in the table.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_forwardThe condensation process of vapors on the outside of horizontal tube banks is described by the equation below, NNU = 0.725 (gp² hfg Do³) μ Δt Ν k where N tubes/row At = hfg Density, p Dynamic viscosity, μ Latent heat, hfg Thermal conductivity, k AT = difference between wall surface & R-22 NNu 3 1,109 kg/m 0.00018 Pa s = Refrigerant - 22 condenser operating at 45 C cooled with water from cooling tower entering at 30 C and leaves at 36 C. The condenser is shell-tube type with copper tubes of 14 mm ID & 16 mm OD arranged with 3 tubes per row (N). a) Considering the results of sample problem #2 (fw = 6,909.4 W/m²K film coefficient at water side), compute the overall heat transfer coefficient based on outer surface area in W/m² K of a water-cooled shell-tube R-22 condenser. At 45 C R-22 properties are: 160.9 kJ/ kg 0.0779 W/m K (*50-45) = 5 C (*from sample problem #2 pipe wall temperature) diff. of temp between wall & fluid latent heat of condensation generally a function of (NR₂. Nor) D/ karrow_forwardPlease solve this question, Thank you ery much.arrow_forward
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