1. By increasing the flow rate, the overall heat transfer coefficient increases? Explain.
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![Question:
1. By increasing the flow rate, the overall heat transfer coefficient increases? Explain.
2. Decreases maximum heat transfer occurs in which flow rate of cold and hot water?
3-In which flow AT_ LMTD is more? Why?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0cd30207-507e-4164-a457-7e20e5362456%2F36ae18b1-27c4-4b88-8d6b-4a67394500a1%2F9s8wut7_processed.jpeg&w=3840&q=75)
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- 6.3 Steam at 100 kPa and is flowing across a 5-cm- OD tube at a velocity of 6 m/s. Estimate the Nusselt number, the heat transfer coefficient, and the rate of heat transfer per meter length of pipe if the pipe is at .6.1 Determine the heat transfer coefficient at the stagnation point and the average value of the heat transfer coefficient for a single 5-cm-OD, 60-cm-long tube in cross-flow. The temperature of the tube surface is , the velocity of the fluid flowing perpendicular to the tube axis is 6 m/s, and the temperature of the fluid is . Consider the following fluids: (a) air, (b) hydrogen, and (c) water.Water at a temperature of 20 oC with a mass flow rate of 0.015 kg/s enters the pipe 2.5 cm in diameter with a uniform surface temperature of 90 oC. a) Determine the length of the thermal inlet region, Lt.b) If it is assumed that the flow is hydrodynamically and thermally formed, calculate the convection heat transfer coefficient and the length of the pipe required to heat the water to 70 oC.c) What is the rate of heat transfer to the water?d) Calculate the friction factor and pressure drop.
- Water flows in a 3.5-cm-diameter pipe so that the Reynolds number based on diameter is 2000 (laminar flow is assumed). The average bulk temperature is 10°C. What would the heat transfer coefficient be in W/m2.°C for such a system if the tube wall was subjected to a constant heat flux and the velocity and temperature profiles were completely developed? Evaluate properties at bulk temperature.Water going into a pipe with a tempeture of T1 and going out T2 . ambient tempeture is T0. flow rate q. Develop an expression for T2 ( based on heat transfer) Length of the pipe Lh0 - convective heat transfer coefficient of the airhW -convective heat transfer coefficient of the waterk- pipe thermal conductivity (W/m·K)d – pipe diameter Use any other varilable that you need and can be found online easily .Water is flowing through 40-mm diameter 4-m long tube with a rate of 2kg/s. Tube surface temperature is maintained at 100 oC and the water enters the tube at 27oC. a) What is the outlet temperature of the water? b) What is the corresponding heat transfer rate?
- a)Identifythe maximum velocitylimitof ammonia gas in the pipe if the flow is to be maintained as laminar flow. b)If the actual velocity of ammonia gas is 0.9 times the maximum velocitylimit, calculatethe heat transfer coefficient and heat transfer flux if the heat transfer area is 0.16m^2. c)Suppose the pipe has an outer diameter of 43.1 mm and the outer surface wall temperature of the pipe is 356 K, determinethe thermal resistance and thermal conductivity of the pipe.What is the formula to solve h1 and h2 (heat transfer coefficient)here? h1 (water) h2 (air).Q4: (20 Marks) The local heat transfer coefficient hy = 5 x0.75 for flow of water over a 2 m long and 0.5 m wide plate. Estimate expression between average heat transfer coefficient h and the local heat transfer coefficient h..
- consider a flow of water in a cylinder maintained at constant temperature of hundred degree Celsius the diameter of the cylinder is 15 and the length of the tube is 6 metre the inlet and outlet temperature of the water is TI equal to 15 degree Celsius and equal 57 degrees celsius find the average heat transfer Coefficient associated with the flow of water mass flow rate is 2.25 kilogram per second and cp=4.178KJ/aKg.KEngine oil at 0.3 kg/s flow rate (cp=2100 J/kg°C) 2 cmat a temperature of l30°C in a thin-walled copper pipe in diameterit will be heated from 20°C to 60°C by condensing steam outside.Total heat transfer coefficient 650 W / m2For ° C, heat transferpipe required to achieve the speed and speed of this heat transferfind the length.Heat transfer problem Water flows through a thin-walled cylindrical tube of diameter 1 cm, maintained at a uniform temperature, ?s = 360 K. The inlet and outlet temperature of water was found to be ?i= 280 K and ?o = 355 K, respectively. (a) What is the log mean temperature difference in this case? (b) If the mass flow rate is 0.005 kg/s, what is the total rate of heat transfer from the tube to the water? (c) What is the Reynolds number corresponding to the given flow conditions? (d) Assuming fully developed flow in the entire tube, what should be the length of the tube to allow the abovementioned operating conditions ?
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