Air at 20°C and 1 atm flows over a long cylinder at 1 m/s. The cylinder...
Air at 20°C and 1 atm flows over a long cylinder at 1 m/s. The cylinder has a
diameter of 10mm and its initial temperature is 134°C. If the density, specific heat, and 3
conductivity of the cylinder are 7832 kg/m , 549 J/kg.K, and 49.2 W/m.K, respectively, calculate the temperature on surface of the cylinder after 100 seconds.
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Air at 20°C and 1 atm flows over a long cylinder at 1 m/s. The
cylinder...
Problem 1: Air at 20°C and 1 atm flows over a spherical object at 1 m/s....
Problem 1: Air at 20°C and 1 atm flows over a spherical object at 1 m/s. The sphere has a diameter of 10mm and its initial temperature is 134°C. If the density, specific heat, and conductivity of the sphere are 7832 kg/m , 549 J/kg.K, and 49.2 W/m.K, respectively, calculate the temperature at the center of the sphere after 100 seconds. Problem 3: Consider the sphere that was described in problem 1. If we place that hot sphere in a...
Heat Transfer or. S. E. Beladi, PE Make Up Final Test Wednesday, January 9, 2019 Name...
Heat Transfer or. S. E. Beladi, PE Make Up Final Test Wednesday, January 9, 2019 Name ID : 4. A steel plate of 2-5 cm heated to an initial temperature of To 550 C for a heat treatment process and is plunged into water bath at constant temperature of T 50 C. The density, specific heat, and thermal conductivity of the plate is p- 8000 kg/m and c 420 J/kg.K, and & 1 W/m.K, respectively. The heat transfer coefficient of...
A long cylinder of diameter D 0.012 m, thermal conductivity k 358 W/(mK), density p -...
A long cylinder of diameter D 0.012 m, thermal conductivity k 358 W/(mK), density p - 7614 kg/m3, specific heat c 418 J/(kgK) is initially at a uniform temperature of Ti-74°C. The cylinder is suddenly exposed to a gas at T,-18 ℃ The convection coefficient is h -17 W/(m2K). Verify that a lumped capacitance analysis can be used for the transient response of the cylinder temperature. What is the time t in seconds for the cylinder temperature to become Tf-32...
1. Heat is generated at a uniform steady rate in a long solid cylinder. The cylinder...
1. Heat is generated at a uniform steady rate in a long solid cylinder. The cylinder loses heat from its exposed surface to surroundings at constant temperature. Show that the radial temperature profile in the cylinder can be represented by the equation: T, = Twer - 9 4k where qy is the rate of heat generation per unit volume and Tur is the maximum temperature in the profile. [30%] In a long solid cylinder of 40mm diameter heat is generated...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of 2 cm and a length of 20 m. The outer surface temperature of the cylinder is 100 °C. The average Nusselt number is 38. The speed of the air before it reaches the cylinder is 10 m/s. Moreover, the freestream temperature of the air before it gets dose to the cylinder are 20 oc. If needed. You may consider the following thermohysical properties of...
Air compressors are sometimes installed in four-wheel drive vehicles to allow for maintaining tyre pressures whilst in the outback. One notable problem with this system is the increase in air temperat...
Air compressors are sometimes installed in four-wheel drive vehicles to allow for maintaining tyre pressures whilst in the outback. One notable problem with this system is the increase in air temperature during compression, which leads to the heating up of metallic fittings on the compressor and hose, posing a thermal risk to operators. The compressor compresses air isentropically from atmospheric pressure to 300 kPa. The inlet air temperature is 300K. (a) What is the temperature of the air at the...
A resistor, part of a circuit, is dissipating at 0.1 W. It is shaped like a...
A resistor, part of a circuit, is dissipating at 0.1 W. It is shaped like a cylinder with a radius of 1.8 mm and a length of 1 cm. If the air in the cabinet is at 308 K and the resistor has a heat transfer coefficient of h = 13 W/m2K for natural convection and hrad of 6.5 W/m2K, what is the resistor’s temperature? Assume heat is lost by only convection and radiation in a parallel circuit. Now if...
Question 3 (40 marks) (a) Air enters a horizontal nozzle with a velocity of 1 m/s,...
Question 3 (40 marks) (a) Air enters a horizontal nozzle with a velocity of 1 m/s, a pressure of 2 bar and a temperature of 350 K. At exit from nozzle, the air temperature is 450 K. The combined rate of specific heat transfers, and specific work transfers, w to the air as it passes through the nozzle is 150 kJ/kg. Assume that the air flow is steady and air can be treated as perfect gas with = 1005 J/(kg.K)....
please show me the whole work for question 4) and 5),thank you so much An insulating...
please show me the whole work for question 4) and 5),thank you
so much
An insulating wall is composed of 10 cm of a material having an thermal conductivity of 5 W/m.K, and an unknown thickness of cork, which has a thermal conductivity of 0.045 W/m.K. How thick must the cork be if the heat losses through the wall are to be less than 10W/m2 when the inside temperature is 20degree C and it's -20degree C outside? Water flows through...
Consider a solid body having mass m, volume V, density = 10000 kg/m3 , specific heat...
Consider a solid body having mass m, volume V, density = 10000 kg/m3 , specific heat capacity at constant pressure Cp = 600 J/(kg.K), and its initial temperature Ti = 200oC. Assume the system losses heat to the environment by convection at temperature T = 40oC and heat transfer coefficient h = 12 W/(m2 .K). (a) Start with applying the energy balance, and use the concept of the simplified lumped system analysis to derive an expression for the change of...
Heat Transfer or. S. E. Beladi, PE Make Up Final Test Wednesday, January 9, 2019 Name ID : 4. A steel plate of 2-5 cm heated to an initial temperature of To 550 C for a heat treatment process and is plunged into water bath at constant temperature of T 50 C. The density, specific heat, and thermal conductivity of the plate is p- 8000 kg/m and c 420 J/kg.K, and & 1 W/m.K, respectively. The heat transfer coefficient of...
A long cylinder of diameter D 0.012 m, thermal conductivity k 358 W/(mK), density p - 7614 kg/m3, specific heat c 418 J/(kgK) is initially at a uniform temperature of Ti-74°C. The cylinder is suddenly exposed to a gas at T,-18 ℃ The convection coefficient is h -17 W/(m2K). Verify that a lumped capacitance analysis can be used for the transient response of the cylinder temperature. What is the time t in seconds for the cylinder temperature to become Tf-32...
1. Heat is generated at a uniform steady rate in a long solid cylinder. The cylinder loses heat from its exposed surface to surroundings at constant temperature. Show that the radial temperature profile in the cylinder can be represented by the equation: T, = Twer - 9 4k where qy is the rate of heat generation per unit volume and Tur is the maximum temperature in the profile. [30%] In a long solid cylinder of 40mm diameter heat is generated...
ICLO-21 Air flows over a cylinder with circular cross section that has an outer diameter of 2 cm and a length of 20 m. The outer surface temperature of the cylinder is 100 °C. The average Nusselt number is 38. The speed of the air before it reaches the cylinder is 10 m/s. Moreover, the freestream temperature of the air before it gets dose to the cylinder are 20 oc. If needed. You may consider the following thermohysical properties of...
Question 3 (40 marks) (a) Air enters a horizontal nozzle with a velocity of 1 m/s, a pressure of 2 bar and a temperature of 350 K. At exit from nozzle, the air temperature is 450 K. The combined rate of specific heat transfers, and specific work transfers, w to the air as it passes through the nozzle is 150 kJ/kg. Assume that the air flow is steady and air can be treated as perfect gas with = 1005 J/(kg.K)....
please show me the whole work for question 4) and 5),thank you
so much
An insulating wall is composed of 10 cm of a material having an thermal conductivity of 5 W/m.K, and an unknown thickness of cork, which has a thermal conductivity of 0.045 W/m.K. How thick must the cork be if the heat losses through the wall are to be less than 10W/m2 when the inside temperature is 20degree C and it's -20degree C outside? Water flows through...
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