Example: long aluminum cylinder 5.0 cm in diameter and initially at 200◦C is suddenly exposed to a convection environment at 70◦C and h = 525 W/m2 · ◦C. Calculate the temperature at a radius of 1.25 cm and the heat lost per unit length 1 min after the cylinder is exposed to the environment.

Q: A brass rod 100 mm long and 5 mm in diameter extends horizontally from a casting at 200 °C.…

A: Given:The length of the brass rod is the diameter of the rod is the temperature of the casting is…

Q: To confirm that a double-pane window is indeed better than a single-pane window, you ran some tests.…

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Q: A homeowner wants to reduce their monthly heating bill and carbon footprint and is considering…

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Q: The temperature distribution across a wall 0.25 m thick at a certain instant of time is T(x) = a +…

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Q: 4) A spherical container is filled with iced water at 0°C. The tank is made of iron (k=15 W/m.°C)…

A: Here we will calculate equivalent resistance and use it to get heat transfer

Q: A glass door is used on a fireplace to reduce exfiltration of room air through the chimney. The…

A: The mean film temperature is The Rayleigh number is

Q: Q2: 0.2 m diameter, 4 mm thick, k-120 W/m.ºC disc is welded to 10 cm diameter hot bar at 120 °C…

A: The thickness of disc is The diameter of disc is The temperature of air is The convective heat…

Q: Heat is generated in a 1.4 m long and 0.2 cm diameter electrical resistance wire placed in the…

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Q: A machine element as seen in the figure is made of pure copper. It has an inner diameter of D;=2.9…

A: Given that, Inner diamter of element, Di=2.9 cm,Outer diameter of element, Do=5.9 cm,Height of…

Q: You may have noticed that bridge decks are often built with expansion joints that permit the deck to…

A: To full fill the quality parameters , we can  not provide hand written solution…

Q: wo heat reservoirs with respective temperatures of 325 and 275 K are brought into contact by an iron…

A: Given   Thermal conductivity, k = 79.5 W/m K              Temperature, T1 = 325 K…

Q: P3. After a particularly cold night, Alice leaves a tub of water outside. You may consider the…

A: Given: Ground temperature Tc=-10°CAir temperature (Th)=10°CInitial thickness of water (h0)=10cm or…

Q: Below is a diagram of a pipe with 5 m radius, temperature of 5000 K, and k = 450 W/m-K. The pipe is…

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Q: J 6 A semi-infinite solid, with a boundary condition of convection on the surface (Tfluid = 100°, h…

A: Given:The temperature of the fluid, The convective heat transfer coefficient, At time , the uniform…

Q: Electrical current flows through a cylindrical cable with a diameter of d = 4 mm generating thermal…

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Q: -cm cube of stainless steel is initially at 500oC. It is suddenly immersed in a tank of oil…

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Q: Steel is sequentially heated and cooled to relieve stresses and to make it less brittle. Consider a…

A: SteelExplanation:Step 1:Step 2:Step 3: Step 4:

Q: Your answer is incorrect. Try again. A soda lime glass sphere of diameter D₁ = 25 mm. encased in a…

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Q: As seen in the figure, a composite wall consists of three different materials (Material Material-B,…

A: Heat flow remains constant through the three slabs from Fouriers law we know that  q= -kdTdXk =…

Q: 4. A large block of Aluminum is initially at uniform temperature of 40 °C the surface is exposed to…

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Q: A pipe of length L connects to thermal reservoirs that are kept constant at temperatures T₁ and T₂.…

A: GivenReservoirs temeprature T1 and T2length of the pipe =Lx=0.2L

Q: Example 3.3: The temperature at the center of a tender-boiled potato needs to be 98.9°C. Let's take…

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Q: 3. (a) What is the physical interpretation of the Grashof number? (b) A glass-door firescreen, used…

A: 3- a) grashoff no. is defined as the ratio of the buoyancy force to the viscous force. Like in…

Q: In a thermal power plant, a horizontal copper pipe of "D" diameter, "L" length and thickness 1.2 cm…

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Q: 19 mm diameter steel balls are quenched by heating to 989 K followed by slow cooling to 400 K in an…

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Q: A 30 mm diameter copper sphere and a 30 mm copper cube are both heated in a furnace to 923 K. They…

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Q: A 2x2-m glass window, 1 cm thick is subjected to 10°C and 3°C inner and outer temperatures…

A: As per given question A 2x2-m glass window, 1 cm thick is subjected to 10°C and 3°C inner and outer…

Q: The rear window of a car is defrosted by the passage of warm air on the internal surface. If the…

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Q: Refer to the rectangular region in the figure below, the inner boundary surfaces are insulated and…

A: Conduction heat transfer is the transfer of heat by virtue of direct contact or molecular…

Q: A 15 cm outer diameter steam pipe is lagged to 25 cm diameter with magnesia of thermal conductivity…

A: At temperatures T∞1 and T∞2, one-dimensional heat transfer through a simple or composite body…

Q: A temperature difference of 85oC exists across a fibreglass insulation layer 13 cm thick, for which…

A: Given Data K=0.035 W/mK Thickness, t=0.13m Temperature difference, ∆T=85°C

Q: To avoid overheating, natural convection analysis is to be considered. If the minimum allowable heat…

A: Write the given data in the problem. Ts=45°CTa=32°C Q=30 W Here, Ts is the surface temperature, Ta…

Q: A metal die, shaped like a hockey puck, is 80 mm in diameter and 50-mm thick. The thermal…

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Q: A 4 m thick steel plate initially at 225 °C. Suddenly, both surfaces are exposed to an ambient at 25…

A: The Biot numberThe Biot number (Bi) is a dimensionless quantity used in heat transfer calculations.…

Q: and a = 0.0166 m-/h. Calculate the time required for the temperature change to reach half its final…

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Q: John is employed by a new food processing plant where eggs are to be boiled in large quantities to…

A: Write the given data with suitable variables. d=5 cm=0.05 m100 cm1 mr=1000 kg/m3cp=3300 J/kgKh1=1500…