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- A mercury-in-glass thermometer at 40C(OD=1cm) is inserted through a duct wall into a 3 m/s airstream at 66C. This can be modelled as a cylinder in cross-flow, as shown in the figure. Estimate the heat transfer coefficient between the air and the thermometer.An electric heater heats the inner tube walls of a concentric tube annulus at a rate of 2000 W/m. The inner and outer tube diameters are 25 and 50 mm respectively. Water enters the annular region at 25 ⁰C and leaves at 85 ⁰C. The flow rate of water is 0.04 kg/s and the outer tube wall is insulated. Assuming that fully developed conditions exist at the outlet, the inner tube surface temperature at the outlet will be ?Example 29.18 In an oil cooler of the counter flow type 5000kg.per of oil of specific heat 0.6 are cooled from 40°C to 24°C by means of 6000 kg/hr of water which enter at 15°C. Find the cooling surface required if the overall coefficient of heat transmission is 3000 kcal/ in² hour °C?
- In an oil cooler of the counter flow type 5000 kg per hour of oil of specific heat 0.6 are cooled from 40°C to 24°C by means of 6000 kg per hour of water which enters at 15°C.find the cooling surface required if the overall coefficient of heat transmission is 3000 kcal/m^2 hour °C.An incompressible fluid flows through a rectangular cross section duct, with width much larger than height of the cross section. The duct surface is heated at a uniform rate along its length. If the centreline of the flow is along the centre of the duct where y = 0, the distance from the centreline to the surface of the duct is b = 25 mm, and the thermal conductivity of the fluid is 0.6 W/mK, what is the local heat transfer coefficient in the developed region of the flow? Give your answer in W/m2K to 1 decimal place.An incompressible fluid flows through a rectangular cross section duct, with width much larger than height of the cross section. The duct surface is heated at a uniform rate along its length. If the centreline of the flow is along the centre of the duct where y = 0, the distance from the centreline to the surface of the duct is b = 25 mm, and the thermal conductivity of the fluid is 0.6 W/mK, what is the local heat transfer coefficient in the developed region of the flow? Give your answer in W/m2K to 1 decimal place. I AM POSTIING THIS AGAIN. PLEASE STOP ? COPY FROM INTERNET AND SEND RANDOM SOLUTION. HINT THE FINAL ANSWER IS 38.4 But i need step by step solution. if you don't get this value don't send it please, reject and add the credit
- A getter screen consists of a cylinder of length l = 0.3m, diameter d=0.25m and its circular based plate. The getter screen is cooled with liquid nitrogen and coated completely with deposited titanium providing a constantly fresh surface. Sticking probability s=1 for N2 and mean thermal velocity = 470m/s. Find the pumping speed.Air that is fully-developed flows in a rectangular duct of inside dimensions 0.610 m x 0.305 m. The inlet air temperature is 21.1°C, and at outlet the air temperature is 26.7°C. If the mass flow of air is 2.72kg/h and the duct length is 2.44 m, calculate (a) the required heat in the form of a constant wall flux to heat the air and (b) the pressure drop due to friction. Also, solve for (c) h and (d) Ts,i.A constant heat flux of 40 W/cm² is applied from the outside to the three surfaces (top surface adiabatic) of a 6cmx6cm square pipe. Water enters the pipe at 25°C and its flow rate is 1 kg/s. If the length of the channel is 1.5 m, what will the outlet temperature of the water be? You can get the properties of water at 320K.
- 24. Water at 80 F is flowing over a flat plate with a velocity of 8 ft/s. The plate is5 ft long. Find and plot the heat transfer coefficient as a function of the platelength.Air at 10 atm and 77 C flows in a duct of rectangular cross section, 20 cm by 10 cm, at a rate of 0.001 kg/s. Find a) the flow regime and b) the heat transfer coefficient. The duct is also at 77 C.The condenser of a steam power plant consists of AISI 302 Stainless steel tubes, each with outer and inner diameters of 35 mm and 30 mm, respectively. Saturated steam at 0.135 bar condenses on the outer surface of the tube, while water at a mean temperature of 295 K is in fully developed flow through the tube (you can assume that 295 K is the mean temperature in the axial direction of the tube (e.g. along its length) or you may assume that the inlet water temperature is 295 K). For a water mass flow rate of 0.22 kg/s, what is the outer surface temperature of the tube and the rates of heat transfer and steam condensation per unit tube length? As an approximation you may evaluate the properties of the liquid film at the saturation temperature.