9-94 A hot liquid (c, = 950 J/kg-K) flows at a flow rate PtD of 0.005 kg/s inside a tube with a diameter of 25 mm. At the tube exit, the liquid temperature decreases by 8°C from its temperature at the inlet. The hot liquid causes the tube surface temperature to be 120°C. To prevent thermal burn hazards, the tube is enclosed with a concentric outer cover of 5 cm in diameter. Determine whether the outer cover temperature is below 45°C to prevent thermal burns in contact with human skin. Evaluate the properties of air in the concentric enclosure at 80°C and 1 atm pressure. Is this a good assumption? Outer cover at T,

9-94 A hot liquid (c, = 950 J/kg-K) flows at a flow rate PtD of 0.005 kg/s inside a tube with a diameter of 25 mm. At the tube exit, the liquid temperature decreases by 8°C from its temperature at the inlet. The hot liquid causes the tube surface temperature to be 120°C. To prevent thermal burn hazards, the tube is enclosed with a concentric outer cover of 5 cm in diameter. Determine whether the outer cover temperature is below 45°C to prevent thermal burns in contact with human skin. Evaluate the properties of air in the concentric enclosure at 80°C and 1 atm pressure. Is this a good assumption? Outer cover at T,

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.27P

See similar textbooks

Similar questions

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.
Heat Transfer Question is image
i need the answer quickly
Shown in the figure,a card is cooled with water. To cool the cardWater 0.4 m / s in the circular pipe system placed on the bottomaverage speed and entering at a temperature of 20 oC, at a temperature of 24 oCcomes out. Electronic components on the board of 1.5 kWthey produce energy. At the same time, from the card surface to the mediumApproximately 0.05 kW of heat loss occurs by convection. Continuous flowFind the mass flow rate of the water for the conditions. Specific heat of waterYou can get = 4.22 as ?? / ???.
***answer is correct
Harry up plz
Water is flowing through a 25-mm diameter and 10-m long tube. The water enters the tube at 20\deg C with a mass flow rate of 0.2 kg/s. The outlet mean temperature is 60\deg C, and the tube surface temperature is maintained constant. Determine the hydrodynamic and thermal entry.lengths. Is the flow fully developed? What is the convective heat transfer coefficient inside the pipe?
Harry up plz
Engine oil flows at a rate of 0.05 kg/s through a section of a 2.5 cm diameter tube. The oil enters the section at a temperature of 50 C. The tube wall is kept at 20 C, and it can be assumed that the flow through the section is fully developed. The section of the tube is 5 m long. (a) What is the exit temperature of the oil? (b) What is the heat transfer rate from the oil to the tube wall?
Heat Transfer Lesson The temperature will be increased from 10 (Degree Celsius oC) to 90 (Degree Celsius oC) while the water flows through a 1.5 cm inner diameter and 7 meter long straight pipe. Equipped with electric heater on the entire surface of the pipe. Even heating throughout. The outer surface of the heater is well insulated and therefore all heat generated in the heater in continuous operation is transferred to the water in the pipe. If the system provides a hot water flow rate of 6 liters / minute. (Thermophysical properties of water at 50 oC:ρ = 988 m3/kg, k= 0.6305 W/m oC, cp=4181 J/kg oC, Pr=3.628, μ= 0.0005471 kg/m.s ) a)Find the power of the resistance heater [W]. b)Calculate the inner surface temperature [oC] of the pipe at the outlet. c)Find the pressure drop [Pa]. d)Find the pump power [W] required to overcome this pressure drop.
This is a complete question I am stuck in. Kindly answer as soon as possible.