What is the ratio of total convective heat transfer rate to laminar convective heat transfer rate for the flow ov m length flat plate if 10 m/s air velocity is observed? For air: v = 20x10-6 m²/s ütfen birini seçin: A. 0.50 B. 0.32 C. 2.0 D. 3.11
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- 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.Choose the right answer 1. The mean Nusselt number for fully developed laminar flow in a circular tube under a constant heat flux a. depends on Reynolds number b. depends on Prandtl number c. is constant 2. The value of Prandtl number for air is about а. О.1 b. 0.3 с. 0.7 3. In natural convection heat transfer, the Nusselt number is a function of a. Re and Pr b. Re and Gr c. Grand Pr 4. A fluid is flowing along a plate having a high uniform wall temperature. The heat transfer along the length a. decreases b. remain constant c. increases 5. For fully developed laminar flow and heat transfer in a heated long circular tube, if the flow velocity is doubled and the tube diameter is halved, the heat transfer coefficient will be a. four times of the original value before b. half of the original value с. same as d. double of the original valueWater flows in a duct having a cross-section of 10x20 mm with a mean bulk diameter of 15.56 deg C. If the duct wall temperature is constant at 60 deg C and fully developed laminar flow prevails. a.) Calculate the heat transfer coefficient, h in W/m2-deg Cchoices: (405, 305, 151, 252) b.) What is the thermal conductivity of water at the given temperature, k in W/m-deg Cchoices: (0.604, 0.6, 0.585, 0.595) c.) Calculate the heat transfer rate per unit length in W/mchoices; (605, 366, 505, 404)
- Heat transfers Water (T= 10 C, , k=0.644 W/m.C, υ = 5.54× 10^-7 m2/s, Pr=3.55), flow over plate 1m x 1m , with velocity 2 m/s. the plate surface temperature is 90 C. Give the answer for the following: Nu number equal to Total heat transfer The flow type The average heat transfer coefficientWhat is the ratio of total convective heat transfer rate to laminar convective heat transfer rate for the flow over 2 m length flat plate if 10 m/s air velocity is observed? For air: ν = 20x10-6 m2/s1. Experimental analysis was carried out about turbulent convective heat transfer in trapezoidal cross-sectioned duct.Average Nusselt numbers and Reynolds numbers were determined for each experiment and the following data set have beenobtained from this investigation. Find an engineering correlation between the average Nusselt number and Reynolds numberin the form ofNu = aReb
- O. Air with free stream temperature of 10 C is flowing over a flat plate (1.5m long and Im wide). The air is flowing along 1.5m side of the plate. The plate is maintained at 90'C. Find the velocity of air required to have a rate of heat dissipation as 3.75 kW. Use the correlations: Nu =0.664Reos Pro33 for laminar flow Nu, = (0.037RE-871)Pr3 for turbulent flow Take the properties p = 1.0877 kg/m u=2.029×10 m/s, k=0.028 W/mK, C,-1.007KJ/kg.K and Pr-0.703Topic: Heat transfer Completely solve and box the final answer. 1. A 20degC water flows to 50cmx60cm flat plate with velocity of 5.2m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?-1/5 A// For laminar flow over a flat plate, the local heat transfer coefficient h, is known to vary as x¹/5, where x is the distance from the leading edge (x =0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate to the local coefficient at x? for velocity equation u= 2-0.43x+x² Plot the local heat transfer coefficient over a 0.8 cm length(take T-35c) B// Air at 1 atm and 15°C flows through a long rectangular duct 7.5 cm by 15 cm. A 1.8-m section of the duct is maintained at 120°C, and the average air temperature at exit from this section is 65°C. Calculate the airflow rate and the total heat transfer
- Air at 0.8 atm enters at 18 C. Flows across bank of tubes 13 rows high and 7 rows deep at velocity of 9 m/s .The surfaces of tubes are maintained at 78 . The length of tubes is 1.2 m and the diameter of 1.5 cm .They are arranged in staggered manner so that the spacing in both the vertical and horizontal direction are 3cm and 2.25cm respectively. Calculate the total heat transfer and the exit air temperature.Describe the process of internal flow convection heat transfer in an annular tubeconcentric and draw3.2. Air flows parallel to a roof surface with a temperature of 10°C, and a velocity of7,5as given in the figure. Roof surface has a temperature of 30°C. Determine convective heat transfer rate from the roof. (k= 0.02514 W/m°C, Y= 1.516x10$ m²/s, Pr= 0.73) VELOCITY = 7,5 5m 4 m Air TF 30°C 7 km/h Too 10°C 4 m 3 m