(a) Air at 1 atm (abs) is flowing through a tube having an inside diameter of 50 mm at a velocity of 15 m/s, average temperature of 350 K. The inside wall temperature is held constant at 400 K by steam condensing outside the tube wall. (i) Calculate the heat transfer coefficient. (ii) How will the heat transfer coefficient change if increasing the flow velocity and why? (b) Water at 1 atm flows inside a tube of 15 cm diameter under local boiling conditions where the tube wall temperature is 18°C above the saturation temperature. (i) Estimate the heat transfer rate in a 2 m length of tube. (ii) For the same conditions, the boiling pressure is increased to 10 atm, estimate the heat transfer rate. (iii) Comment on the effect of pressure on the boiling heat transfer coefficient and heat transfer rate.

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Problem 4. In order not to damage the resistance in the kettles, the difference between the temperature of the heater and the fluid should not exceed 25 °C. If the heat transfer area between the fluid and the heater is 78.5 cm² and the heat transfer coefficient is 400 W/m².K, find the maximum allowable power of the heater in order to boil water?

Problem 1 Length Required for Cooling Coil A cooling coil made of copper tube is immersed in a regulated constant temperature bath held at a temperature of 18 °C. The liquid flowing through the tube enters at 22 °C, and the coil must be sufficiently long to ensure the exit liquid sustains a temperature of 18.5 °C. The bath is so well stirred that heat transfer resistance at the tube-bath interface is minimal, and the copper wall resistance can also be ignored. Assume Plug Flow Model is applied for fluid flow profile in a tube. Thus, the tube wall temperature can be taken equal to the bath temperature. Use Eq. 1.17 to T(z) Control volume A) Estimate the required tube length (L) under the following conditions for the flowing liquid: Where Tw 1 z+Az T(z+Az) Nu = Since the Reynolds number is in the turbulent range, use the correlation of Sieder and Tate (Bird et al. 1960) to calculate h Nu hD k Pr= Re= C₂= 1 kcal/kg .°C R 0.01 m Vo = 1 m/s P DU OP μ 10³ kg/m³ н = 0.001 kg/m.s k = 1.43 10-4…

Draw flow diagrams for questions 2-4 and solve questions 1-4 with appropriate steps and correct values

Transport Phenomena Question

need the correct ans

A cooling coil made of copper tube is immersed in a regulated constant temperature bath held at a temperature of 18 °C. The liquid flowing through the tube enters at 22 °C, and the coil must be sufficiently long to ensure the exit liquid sustains a temperature of 18.5 °C. The bath is so well stirred that heat transfer resistance at the tube-bath interface is minimal, and the copper wall resistance can also be ignored. Assume Plug Flow Model is applied for fluid flow profile in a tube. Thus, the tube wall temperature can be taken equal to the bath temperature. Use Eq. 1.17 to A) Estimate the required tube length (L) under the following conditions for the flowing liquid: Since the Reynolds number is in the turbulent range, use the correlation of Sieder and Tate (Bird et al. 1960) to calculate h Where B) Discuss on the consequence of decreasing fluid velocity v0 to 0.5 m/s when the other parameters are the same as given. C) Discuss on the consequence of decreasing diameter of tube to 0.01…

PROBLEM BACKGROUND The most common heat exchanger used in industry is a 'shell-and-tube' heat exchanger as illustrated in the figure. One fluid is fed into a set of tubes around which a second fluid is circulated. In the example shown, complex flow patterns illustrated by arrows show the flow may be partially parallel flow and partially crossflow. PROBLEM STATEMENT For this problem, we will consider a single tube in a crossflow configuration as shown. Air is to be heated to the desired temperature to feed a bioreactor. The air is feed flows normal to the outside of the center tube. Saturated steam is flows through the inside of the tube to provide the heat. The air is being fed at an average velocity of 15 m/s though the outer pipe of the heat exchanger at 27 °C and 1 atm. It heated by using saturated steam which condenses at 107°C over the surface of the inner tube. The tube is 5 m long with an outer diameter of 0.015 m and an inner diameter of 0.014 m. For simplicity in answering…

Q: water at 200² flows over 90.3m square Plate at velocity of 6 m/s at constant Plate is maintained Temperature at 556° calclate the heat by the plate. heat Transfer