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![50+20 =35°C 50 +20 Nusselt number for fully developed flow inside tube i8 Nu = 4.36 for å is. constant] the means temperature](http://img.homeworklib.com/questions/e4e74c90-f53c-11ea-a9cd-9b14e9ad169a.png?x-oss-process=image/resize,w_560)
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View Policies Current Attempt in Progress - 125 Air at a temperature Tmi -20°C and p...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm diameter, 1.75 m tube with a mass flow rate of 6 x 10-4 kg/s. A constant heat flux warms the air so that its exit mean temperature is Tm, 0 = 50°C. Find the required heat flux and wall surface temperature at the outlet. Assume fully developed flow. Step 1 What is the heat rate transfer to the air from the tube, in W?...
8.12 Dry, compressed air at Tm.i75°C, p-10 atm, with a mass flow rate of 0.001 kg/s,...
8.12 Dry, compressed air at Tm.i75°C, p-10 atm, with a mass flow rate of 0.001 kg/s, enters a 30-mm-diameter, 5-m-long tube whose surface is at Ts - 25°C. (a) Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. For these conditions the fully developed heat transfer coefficient is h- 3.58 W/m2...
8.12 Dry, compressed air at Tm,i 75°C, p- 1o atm, with a mass flow rate of a 30-mm-diameter, 5-m-...
part b only please8.12 Dry, compressed air at Tm,i 75°C, p- 1o atm, with a mass flow rate of a 30-mm-diameter, 5-m-long tube whose surface is at T, 25°C. 0.001 kg/s, enters (a) Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. For these conditions the fully developed heat transfer coefficient is...
Question 2 of 4 < > - / 25 View Policies Current Attempt in Progress Air...
Question 2 of 4 < > - / 25 View Policies Current Attempt in Progress Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m2. Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x). in °C, and the...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diame...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diameter D, = 20 mm and an outer tube of diameter Do-80 mm. Saturated steam flows through the inner tube, maintaining its surface at uniform temperature of T,i 100°C, while the outer surface of the outer tube is well insulated. If fully developed conditions may be assumed throughout the annulus, how long must the system be to provide an outlet...
-/25 !!! Current Attempt in Progress Air at atmospheric pressure and a temperature of 25°C is...
-/25 !!! Current Attempt in Progress Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m². Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x). in °C, and the local convection coefficient, hx(x), in W/m².K. at x =...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
u. 107 y. 10° Q.10 (kg/m) 0.9950 (kJ/kg.K) 1.009 (N.s/m?) 208.2 (mʻ/s) 20.92 k. 10 (W/m.K)...
u. 107 y. 10° Q.10 (kg/m) 0.9950 (kJ/kg.K) 1.009 (N.s/m?) 208.2 (mʻ/s) 20.92 k. 10 (W/m.K) 30.0 (m²/s) 29.9 Pr 0.700 Air at p = latm enters a thin-walled long tube at an inlet temperature of Tmi = 100 °C. The diameter and length of the tube are 5 mm and 2 m respectively. A constant heat flux is applied to the air from the tube surface. The air mass flow rate is ṁ = 135 x 10-kg/s. (a) Is...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and mass flow rate of ml . The pipe is half-embedded in insulation as shown in the figure below. Conditions are such that a linearly- increasing heat flux is applied to the exposed top half of the pipe. a. If the heat flux profile is q-q" + Or , derive an equation that describes the mean temperature of the water as a function of its...
Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate...
Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate of heat transfer from the tube wall to the fluid is given as q5'(W/m) - a x, where the coefficient a is 20 W/m2 and x (m) is the axial distance from the tube entrance. (a) Beginning with a properly defined differential control volume in the tube, derive an expression for the temperature distribution T m(x) of the water. Use this expression to determine...
Air at a temperature Tm, i = 20°C and p = 1 atm enters a 25-mm diameter, 1.75 m tube with a mass flow rate of 6 x 10-4 kg/s. A constant heat flux warms the air so that its exit mean temperature is Tm, 0 = 50°C. Find the required heat flux and wall surface temperature at the outlet. Assume fully developed flow. Step 1 What is the heat rate transfer to the air from the tube, in W?...
8.12 Dry, compressed air at Tm.i75°C, p-10 atm, with a mass flow rate of 0.001 kg/s, enters a 30-mm-diameter, 5-m-long tube whose surface is at Ts - 25°C. (a) Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. For these conditions the fully developed heat transfer coefficient is h- 3.58 W/m2...
part b only please8.12 Dry, compressed air at Tm,i 75°C, p- 1o atm, with a mass flow rate of a 30-mm-diameter, 5-m-long tube whose surface is at T, 25°C. 0.001 kg/s, enters (a) Determine the thermal entry length, the mean temperature of the air at the tube outlet, the rate of heat transfer from the air to the tube wall, and the power required to flow the air through the tube. For these conditions the fully developed heat transfer coefficient is...
Question 2 of 4 < > - / 25 View Policies Current Attempt in Progress Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m2. Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x). in °C, and the...
Water at m = 0.025 kg/s and Zn,i = 20°C enters an annular region formed by an inner tube of diameter D, = 20 mm and an outer tube of diameter Do-80 mm. Saturated steam flows through the inner tube, maintaining its surface at uniform temperature of T,i 100°C, while the outer surface of the outer tube is well insulated. If fully developed conditions may be assumed throughout the annulus, how long must the system be to provide an outlet...
-/25 !!! Current Attempt in Progress Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m². Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x). in °C, and the local convection coefficient, hx(x), in W/m².K. at x =...
Problem 3: (35pts) Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 30°C. The tube is of diameter D =60mm, and fully developed conditions with h = 30W/m2K exist over the entire length of L-4m. Take cp-1015 /kg.K 2 (a) (10pts) For the case of uniform surface heat flux at q"-1000W/m, determine the total heat transfer rate q and the mean temperature of the air leaving the tube...
u. 107 y. 10° Q.10 (kg/m) 0.9950 (kJ/kg.K) 1.009 (N.s/m?) 208.2 (mʻ/s) 20.92 k. 10 (W/m.K) 30.0 (m²/s) 29.9 Pr 0.700 Air at p = latm enters a thin-walled long tube at an inlet temperature of Tmi = 100 °C. The diameter and length of the tube are 5 mm and 2 m respectively. A constant heat flux is applied to the air from the tube surface. The air mass flow rate is ṁ = 135 x 10-kg/s. (a) Is...
Water enters a large circular pipe of diameter D with a mean temperature of Tmi and mass flow rate of ml . The pipe is half-embedded in insulation as shown in the figure below. Conditions are such that a linearly- increasing heat flux is applied to the exposed top half of the pipe. a. If the heat flux profile is q-q" + Or , derive an equation that describes the mean temperature of the water as a function of its...
Water enters a 20-mm tube at 27°C with a flow rate of 450 kg/h. The rate of heat transfer from the tube wall to the fluid is given as q5'(W/m) - a x, where the coefficient a is 20 W/m2 and x (m) is the axial distance from the tube entrance. (a) Beginning with a properly defined differential control volume in the tube, derive an expression for the temperature distribution T m(x) of the water. Use this expression to determine...
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