A cylindrical body having 10 cm diameter and lenth of 30 cm passes through a heat treatment furnace which is 6 m in length. The body must reach a temperature of 800°C before it comes out of the furnace. The furnace gas is at 1250°C and body initial temperature is 90°C. How much time it will take to attain the required temperature  ?  Take h = 100 W/m² °C. Take K(steel) = 40 W/m°C and a (thermal diffusivity of steel) = 1.16 x 10-5 m²/s

Q: A water kettle with a small teapot on top is used to brew tea on top, as shown in the figure. The…

A: Given data Pressure of steam inside = P = 0.32 kPa (gauge)We have to find the maximum height that…

Q: For heat transfer purposes, an egg can be considered to be a 4-cm diameter sphere having the…

A: Given : The diameter of the egg is The boiling temperature of water is The heat transfer…

Q: What does the lumped capacity model describe? Give an example (with a drawing) of a heat transfer…

A:

Q: An iron block cools down from 200°C to the room temperature of 27°C, when outdoor is 5°C, heating…

A:

Q: total rate of heat transfer from the cubes to the ambient air, when 2700 cubes are to be annealed…

A: Assumptions 1 The balls are spherical in shape with a radius of r0 = 4 mm. 2 The thermal properties…

Q: 3500J / s of energy is transferred from a heat source to the surface of the part. The heated region…

A: Given:Heat on surface,H=3500Js70% of this heat is concentarted on the metal.So,Input…

Q: applications of DE A body of unknown temperature is taken outdoor where the temperature is constant…

A:

Q: The gas at an average temperature of 160 oC is carried through a steel (steel=46 W/m2.K) pipe with…

A:

Q: What is the ton of refrigeration required to cool 15,000 lbm of fresh pork from a temperature of…

A:

Q: The temperature at the walls of the solid body T(x=0) = T(y=0) = T(z=0) = 100°C. The length of the…

A: Warm conductivity alludes to the capacity of a given material to lead/move heat. It is by and large…

Q: The water vapor is manually compressed in an unknown process until the volume of water vapor (Vw2)…

A: Given that, Mass of air, ma=0.4 kg,Pressure of air, Pa1=250 kPa,Temperature of air, Ta1=300 K,Mass…

Q: 3-26 Consider a person standing in a room at 20°C with an exposed surface area of 1.7 m². The deep…

A: Given data: TB=37°CT∞=20°CA=1.7 m2k=0.3 W/m°CQ=150 Wx=0.5 cm Need to determine the skin temperature…

Q: Q-2/ An office room has an area of 7*5 square meter and 4m height, this room is heated by the…

A: Heat transfer: The transfer of heat from the system to surroundings due to the temperature…

Q: Example 9: A 2-kW resistance heater wire whose thermal conductivity is k = 15 W/m °C has a diameter…

A:

Q: QI/The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and…

A: Given data: v=70 km/h=19.44 m/sqrad=200 W/m2L=8 mT∞=30°C Need to determine the equilibrium…

Q: Initially a household freezer com- partment is filled with air at room temperature T, = 27.0°C. Then…

A: Given:  Initial temperature inside the refrigerator, T1 = 270C = (27+273) K=300 K Initial pressure…

Q: A self-supported steel plate of 8 cm thickness and an initial temperature of 20°C passes through a…

A:

Q: Air enters a 7-cm-diameter and 5-m-long tube at 65°C and leaves at 15°C. The tube is observed to be…

A: Given:Tube diameter, d=7 cm=0.07 mTube length, L=5 mAir inlet temperature, Ti=65oCAir exit…

Q: A rigid 0.5 m³ tank initially contains saturated liquid water at 200°C. A valve on the bottom of the…

A: Given: The volume of the tank, V = 0.5m³ The temperature of saturated liquid water, Tsat = 200ᵒC The…

Q: The temperature of 1.9 kg of water is 100.0°C, but the water is not boiling, because the external…

A:

Q: To cool a piece of glass, initially at a temperature of 93°C, it is immersed in an aluminum tray,…

A: Given data: Initial temperature of the glass piece = 93°C                     Initial temperature of…

Q: mass of ice at -4°C is needed to cool 115 kg of vegetables in a bunker for 24 hours. The initial…

A: Given                           Mass, m = 115 kg       Specific heat of water = 4.22 kJ/kg.K…

Q: Brass plate of 6 cm thickness that are initially at 25 °C are heated by passing it through an oven…

A:

Q: There is a cylindical piece of nickel, that is 5 cm in diameter and 10 cm in length, that is…

A:

Q: A camper has a propane-powered refrigerator. The refrigerator consumes approximately 0.50 kg of…

A:

Q: Q3: A titanium ball (k=20 W/m °C, a=7.1x10-6 m²/s, p=4450 kg/m³, Cp=633 J/kg °C) having a diameter…

A: Given, Properties of titanium ball; k=20 W/(m°C), α=7.1×10-6  m2/s, ρ=4450 kg/m3, Cp=633 J/(kg°C)…

Q: A steel rod, which is free to move, has a length of 200 mm and a diameter of 20 mm at a temperature…

A:

Q: Consider hotdog being cooked in boiling water in a pan. Would the heat transfer be modeled as…

A:

Q: Propane (MW = 44 ; k = 1.13) initially at 30 psia and 215°F, is stored inside a large spherical…

A: Write the given data: MW=44k=1.13P1=30 psiaT1=215 °F=215 +460.67 °R=675.67 °RT2=635 °F=635 +460.67…

Q: An aluminium pan whose thermal conductivity is 237 W/m/°C has a flat bottom whose diameter is 20 cm…

A:

Q: Consider a quasistatic isothermal expansion of an ideal gas from Va ---> Vb at temperature Th.…

A:

Q: Students are casting an aluminum cylinder of diameter D = 2.5 cm and length of L = 10 cm from molten…

A: Given: D=2.5 cm­L=10 cmTi=530°CT=30°CT∞=20°Ch=1000 W/m2°Ck=230 W/mKρ=2710 kg/m3cp=0.9 kJ/kgK

Q: m 15 °C to 75°C. The tube is equipped with an electric resistance heater, ich provides uniform…

A: To find : power rating of the heater and inner surface temperature at the exit of pipe. Given:…

Q: In an aluminum container weighing 0.30 kg are 0.70 kg of water in thermal equilibrium at a…

A: Given data: mAl=0.3 kgmw=0.7 kgQ=2.5K/minT=70°C Need to determine the flux leaking from the…

Q: Two flat infinite slabs, each 5 m thick, are each initially uniform in temperature, with one being…

A: