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A stainless steel tube (kst = 19W/mK) of 2 cm ID and 5 cm OD is insulated with 3 cm thick asbestos(ka = 0.2 W/mK). If the temperature difference between the inner most and outermost surfaces is 600°C, What is the heat transfer rate per unit length?
A stainless steel tube (kst = 19W/mK) of 2 cm ID and 5 cm OD is insulated with 3 cm …
fluids

heat and mass transfer

Mech_59 Asked on 31st July 2023 in Mechanical engineering.
- 537 views
- 1 answers
- 0 votes
A copper pipe having 35 mm OD and 30 mm ID carries liquid oxygen to the storage site of a space shutle at -182° C and 0.06 m3/min. The ambient air is at 20°C and has a dew point of 10°C.
A copper pipe having 35 mm OD and 30 mm ID carries liquid oxygen to the storage site of a …
fluids

heat and mass transfer

Mech_59 Asked on 31st July 2023 in Mechanical engineering.
- 621 views
- 1 answers
- 0 votes
A thin-walled copper tube of outside metal radius r = 0.008 m carries stream at 383 K. It is inside a room where the sourrounding air temperature is 300 K. The tube is insulated with magnesia insulation of an approximate thermal conductivity of 0.071 W/(mK).
A thin-walled copper tube of outside metal radius r = 0.008 m carries stream at 383 K. It is inside …
fluids

heat and mass transfer

Mech_59 Asked on 31st July 2023 in Mechanical engineering.
- 574 views
- 1 answers
- 0 votes
For a current carrying wire of 20mm diameter exposed to air (h = 20 W/m2K), What is the thickness of insulation (k = 0.5 W/mK) for maximum heat dissipation?
For a current carrying wire of 20mm diameter exposed to air (h = 20 W/m2K), What is the thickness of …
fluids

heat and mass transfer

Mech_59 Asked on 25th July 2023 in Mechanical engineering.
- 616 views
- 1 answers
- 0 votes
Heat flows trough a composite slab, as shown below. The depth of the slab is 1m. The k values are in W/mK. What is the overall resistance in K/W?
Heat flows trough a composite slab, as shown below. The depth of the slab is 1m. The k values are …
fluids

heat and mass transfer

Mech_59 Asked on 25th July 2023 in Mechanical engineering.
- 613 views
- 1 answers
- 0 votes
In a manufecturing process, a transparent film is bonded to a substrate as shown in given figure. Assuming the following conditions T∞ = 20 °C, h = 50 W/(m2K) and T1 = 30 °C, calculate the heat flux q0 that is required to maintain the bonded surface at T0 = 60° C.
In a manufecturing process, a transparent film is bonded to a substrate as shown in given figure. To cure the …
fluids

heat and mass transfer

Mech_59 Asked on 25th July 2023 in Mechanical engineering.
- 1K views
- 1 answers
- 0 votes
A laboratory furnace wall is constructed of 0.2 m thick fire clay bricks (k = 1.0 W/m K). The maximum allowable heat transfer rate through the wall of the furnace is 900 W/m2, determine how thick must the insulating layer be?
A laboratory furnace wall is constructed of 0.2 m thick fire clay bricks (k = 1.0 W/m K). The wall …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 650 views
- 1 answers
- 0 votes
A plane wall of a refrigerated van is made of 1.5mm steel sheet (k_s = 25W/(mK)) at the outer surface, 10 mm plywood (k_p = 0.05 W/(mK)) at the inner surface and 20 mm glass wool (k_G=0.01 W/(mK)) in between the outer and inner surfaces. Determine the individual components of the thermal resistance
A plane wall of a refrigerated van is made of 1.5mm steel sheet (k_s = 25W/(mK)) at the outer surface, …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 712 views
- 1 answers
- 0 votes
A hot 16cm x 16cm x 16cm cubical iron block is cooled at an average rate of 80 W. What is the heat flux?
A hot 16cm x 16cm x 16cm cubical iron block is cooled at an average rate of 80 W. What …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 737 views
- 1 answers
- 0 votes
A 1 kW electric resistance heater in a room is turned on and kept on for 50 minutes. What is the amount of energy transferred to the room by the heater?
A 1 kW electric resistance heater in a room is turned on and kept on for 50 minutes. What is …
fluids

heat and mass transfer

Mech_59 Asked on 17th July 2023 in Mechanical engineering.
- 673 views
- 1 answers
- 0 votes

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