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Problem 3 has properties of engine oil: d = 248.7x104 (N.s)/m², p=845.7 kg/m",k=0.1379 W/m-K, Pr= 390.2,...
A 10-mm diameter tube has a maintained surface temperature of 180°C. Engine oil enters the tube...
A 10-mm diameter tube has a maintained surface temperature of 180°C. Engine oil enters the tube at 70°C at a flow rate of 1.3 kg/s and exits at 105°C. Find the length, in m, of the tube and well as the corresponding heat transfer rate, in W. Assume fully developed flow and use the Dittus-Boelter equation to calculate the average Nusselt number. q= W L= m
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...
Engine oil is heated by flowing through a circular tube of diameter D = 50 mm...
Engine oil is heated by flowing through a circular tube of diameter D = 50 mm and length L = 25 m and whose surface is maintained at 150 oC. The flow rate and inlet temperature of the oil are 0.5 kg/s and 20 oC. a. Estimate the outlet temperature Tm,o. B. Average Nusselt number C. Estimate the total heat transfer rate q for the tube.
An oil preheater consists of a single tube of 30-mm diameter and 7-m length, with its...
An oil preheater consists of a single tube of 30-mm diameter and 7-m length, with its surface maintained at 200°C by swirling combustion gasses. The engine oil enters at 90°C and comes out at 144°C. Assume the flow is laminar and both hydraulically and thermally fully developed. Answer the following questions: (a) What flow rate must be supplied to maintain the oil outlet temperature of 144°C? (b) What is the corresponding heat transfer rate? (c) Discuss how you may refine...
2. (25 pts) Engine oil flows with a velocity of 6 m/s over a flat plate...
2. (25 pts) Engine oil flows with a velocity of 6 m/s over a flat plate having 1m length and 1 m width. The oil has a free stream temperature To= 80 °C and the plate surface temperature is maintained at Ts = 0 °C. a. Determine whether the flow over the plate transitions to turbulent regime. b. Calculate the average friction factor and the average heat transfer coefficient for the plate by using the appropriate correlations. c. Calculate the...
An oil engine develops 300 kW and the specific fuel consumption is 0.21 kg/kWh. The exhaust...
An oil engine develops 300 kW and the specific fuel consumption is 0.21 kg/kWh. The exhaust from the engine is used in a tubular water heater, flowing through 25 mm diameter tubes, entering with a velocity of 12 m/s, at 340 °C and leaving at 90 °C. The water enters the heater at 10 °C and leaves at 90 °C, flowing in counter-flow to the hot gases. The air-fuel ratio of the engine is 20, and the exhaust pressure is...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the sam...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
estion 9 10 points Saver Engine oil at 80'C flows over a 5-m-long flat plate whose...
estion 9 10 points Saver Engine oil at 80'C flows over a 5-m-long flat plate whose temperature is 30°C with a velocity of 5.5 m/s. The properties of engine oil at the film temperature of (Ts + T-y2 = (80+ 30y2 = 55°C are p =367 kg/m2, v = 7.045 105 m2/s, k = 0.1414 W/m.*C, and Pr = 1551. Determine the Heat Transfer in kW
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it...
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it passes through a furnace at a speed of 2 cm/s. The furnace has a convection coefficient of 80 W/m2-K and an air temperature of 900°C. The furnace is 3 m long, and the stainless steel enters at 20°C. (a) Using a control volume of length S traveling with the rod, develop a differential equation for the rate of change of...
A 10-mm diameter tube has a maintained surface temperature of 180°C. Engine oil enters the tube at 70°C at a flow rate of 1.3 kg/s and exits at 105°C. Find the length, in m, of the tube and well as the corresponding heat transfer rate, in W. Assume fully developed flow and use the Dittus-Boelter equation to calculate the average Nusselt number. q= W L= m
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...
An oil preheater consists of a single tube of 30-mm diameter and 7-m length, with its surface maintained at 200°C by swirling combustion gasses. The engine oil enters at 90°C and comes out at 144°C. Assume the flow is laminar and both hydraulically and thermally fully developed. Answer the following questions: (a) What flow rate must be supplied to maintain the oil outlet temperature of 144°C? (b) What is the corresponding heat transfer rate? (c) Discuss how you may refine...
2. (25 pts) Engine oil flows with a velocity of 6 m/s over a flat plate having 1m length and 1 m width. The oil has a free stream temperature To= 80 °C and the plate surface temperature is maintained at Ts = 0 °C. a. Determine whether the flow over the plate transitions to turbulent regime. b. Calculate the average friction factor and the average heat transfer coefficient for the plate by using the appropriate correlations. c. Calculate the...
An oil engine develops 300 kW and the specific fuel consumption is 0.21 kg/kWh. The exhaust from the engine is used in a tubular water heater, flowing through 25 mm diameter tubes, entering with a velocity of 12 m/s, at 340 °C and leaving at 90 °C. The water enters the heater at 10 °C and leaves at 90 °C, flowing in counter-flow to the hot gases. The air-fuel ratio of the engine is 20, and the exhaust pressure is...
Problem 2: Heat exchanger (25 points) Cold water (op 4179 J/kg K) enters the tubes of a heat exchanger at 20 °C at a rate of 3 kgs. while hot oil (cp 2200 J/kg.K) enters the shell at 130 C at the same mass flow rate and leaves at 60°C The heat exchanger consistsoftwo shells and 20 tubes, each executing four passes (two passes per shell). If the W/m2-K, assume the tube wall is very thin with convective heat transfer...
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2.K when operating at design and clean conditions. Hot fluid enters the tube side at 101°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 42°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2 K/W. The surface area is 93 m². Assume both hot and cold fluids have...
estion 9 10 points Saver Engine oil at 80'C flows over a 5-m-long flat plate whose temperature is 30°C with a velocity of 5.5 m/s. The properties of engine oil at the film temperature of (Ts + T-y2 = (80+ 30y2 = 55°C are p =367 kg/m2, v = 7.045 105 m2/s, k = 0.1414 W/m.*C, and Pr = 1551. Determine the Heat Transfer in kW
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it passes through a furnace at a speed of 2 cm/s. The furnace has a convection coefficient of 80 W/m2-K and an air temperature of 900°C. The furnace is 3 m long, and the stainless steel enters at 20°C. (a) Using a control volume of length S traveling with the rod, develop a differential equation for the rate of change of...
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