What is the required pipe length

Assignment Help Mechanical Engineering

Reference no: EM132724522

QUESTION 1
A plane wall of a furnace is fabricated from plain carbon steel (k = 60 W/m.K, p= 7850 kg/m3, Cp = 430 J/kg . K) and is of thickness L = 10mm. To protect it from the corrosive effects of the furnace combustion gases, one surface of the wall is coated with a thin ceramic film that, for a unit surface area, has a thermal resistance of 0.02 m2.1(/W. The opposite surface is well insulated from the surroundings. At furnace start-up the wall is at an initial temperature of T1= 200 K, and combustion gases at Teo = 1200 K enter the furnace, providing a convection coefficient of h = 25 W/m2 .K at the ceramic film. Assuming the film to have negligible thermal capacitance. How long will it take for the inner surface of the steel to achieve a temperature of Tsf = 700 K?

QUESTION 2
A plane wall of a furnace is fabricated from plain carbon steel (k = 60 W/m.K, p= 7850 kg/m3, Cp = 430 J/kg.K) and is of thickness L = 10 mm. To protect it from the corrosive effects of the furnace combustion gases, one surface of the wall is coated with a thin ceramic film that, for a unit surface area, has a thermal resistance of 0.01 m2.K/W. The opposite surface is well insulated from the surroundings. At furnace start-up the wall is at an initial temperature of Tj = 200 K, and combustion gases at Teo = 1200 K enter the furnace, providing a convection coefficient of h = 25 W/m2.K at the ceramic film. Assuming the film to have negligible thermal capacitance.

What is the temperature Ts ,0 of the exposed surface of the ceramic film when the inner surface of the steel will achieve a temperature of Tsf = 900 K

QUESTION 3
A thick-walled, stainless steel (AISI 316) pipe of inside and outside diameters Di = 25 mm and Do = 40 mm is heated electrically to provide a uniform heat generation rate of q_dot = 2.0x106 W/m3. The outer surface of the pipe is insulated, while water flows through the pipe at a rate of m_dot = 0.15kg/s. The water inlet temperature is Trn j =15 °C and the desired outlet temperature is Ttmc, = 45°C (Properties of water at 30 °C: cp = 4178 J/kg.K, k = 0.617 W/m.K, mu = 8.03x10-4 kgq-n-1-s-1. Pr = 5.45 ). Under the above conditions, what is the required pipe length?

Reference no: EM132724522

Questions Cloud

Compute the equivalent units for the materials : The Matsui Lubricants plant uses the weighted-average method to account for its work-in-process inventories. Compute the equivalent units for the materials

What is the amount of net income that whack expect : WHACK Company follows the constant payout ratio dividend policy by paying out 30 percent of earnings each year. This year, WHACK expects the dividend

Consumer health informatics : Consumer Health Informatics (CHI) is the field that helps to connect the gap between patients and health resources.

Find what is justin firm required to do to protect : Justin is contemplating retirement and wants, What is Justin's firm required to do to protect its client's confidential information in this type of situation?

What is the required pipe length : How long will it take for the inner surface of the steel to achieve a temperature of Tsf = 700 K What is the temperature Ts ,0 of the exposed surface

Who is eligible to claim their mother as a dependent : Paul pays 40%, James and Ryan pay 15% each, and Amy pays 10%. Who is eligible to claim their mother as a dependent

Highly regarded by the hospital administration : Judie has been the nurse manager of her unit for the past ten years and is highly regarded by the hospital's administration.

Estimate what effect of transaction on individual asset : Estimate What is the effect of this transaction on individual asset accounts, individual liability accounts, and the Owner's Equity account?

What is the expected inflation premium for the second year : Assume the interest rate on a one-year Treasury bill is 4% and the rate on two-year note is 6%. What is the expected inflation premium for the second year

User Account

All Pages