A thin-walled tube with a diameter of 6 mm and length of 20 m is used...

A thin-walled tube with a diameter of 6 mm and length of 20 m is used to carry exhaust gas from a smoke stack to the laboratory in a nearby building for analysis. The gas enters the tube at 200°C and with a mass flow rate of 0.001 kg/s. Autumn winds at a temperature of 15°C blow directly across the tube at a velocity of 7 m/s. Assume the thermophysical properties of the exhaust gas are those of air.
(a) Estimate the average heat transfer coefficient for the exhaust gas flowing inside the tube.
(b) Estimate the heat transfer coefficient for the airflowing across the outside of the tube.
(c) Estimate the overall heat transfer coefficient U and the temperature of the exhaust gas when it reaches the laboratory.(Note: 90°C is a reasonable guess for the tube temperature.)

What is the value for the Nusselt number on the inside of the tube? N ui =

What is the average inside heat transfer coefficient, in W/m²·K? h i =

What is the value of the Nusselt number on the outside of the tube? N u o =

What is the average outside heat transfer coefficient, in W/m²·K? h o =

What is the overall heat transfer coefficient, U , in W/m²·K? U =

What is the temperature of the gas at the outlet of the tube, in °C? T m, o =

Solutions

Expert Solution

Note:plzzz don't give dislike...plzz comment if you have any problem i will try to solve your problem...plzzz give thumbs up i am in need....

samet mamat answered 1 year ago

Next > < Previous

Related Solutions

Air enters a thin-walled, 5-mm diameter, 2-m-long tube at a uniform inlet temperature of 100°C. A...

Air enters a thin-walled, 5-mm diameter, 2-m-long tube at a uniform inlet temperature of 100°C. A constant heat flux is applied to the air from the tube surface. The mean temperature of air at halfway along the tube (at 1 m length) is reported as 126°C. If the tube surface temperature at the exit is 160°C and the local heat transfer coefficient at the exit is 29.5 W/m^2K, determine a) the applied heat flux, b) the rate of energy increase...

A thin-walled capillary tube (diameter=5mm, length=1m) carries steam at 100degreesC The capillary is covered by a...

A thin-walled capillary tube (diameter=5mm, length=1m) carries steam at 100degreesC The capillary is covered by a later of insulation (thermal conductivity=0.10W/mK) and thickness delta. Assume that the heat transfer coefficient in the outside ir is 25W/m2K and its temp is 25degreesC. Compute and plot the steady state heat loss from the tube as a function of the thickness of insulation used for the range 0<delta<2cm

If the wire diameter decreases to 1 mm but the length is still 20 m and...

If the wire diameter decreases to 1 mm but the length is still 20 m and still carrying the same 20.0 A current, the drift speed of electrons will (increase / decrease / stay the same), the current density will (increase / decrease / stay the same), the resistivity of the wire will (increase / decrease / stay the same), the resistance of the wire will (increase / decrease / stay the same), the electric field inside the wire will (increase / decrease / stay...

Consider a 9 mm diameter circular tube, calculate the length of tube that is required to...

Consider a 9 mm diameter circular tube, calculate the length of tube that is required to transfer 100 W of water that circulates through the tube at a rate of 0.08 kg / s. The temperature of the water is kept constant at 50 ° C and the wall of the tube is maintained at 45 ° C.

Hot water from a boiler of power plant are discharged through a 0.2-m-diameter, thin-walled pipe with...

Hot water from a boiler of power plant are discharged through a 0.2-m-diameter, thin-walled pipe with a velocity of 3.5 m/s. The pipe passes through a room whose air temperature is 3°C and the exterior surface of the pipe is uninsulated and pipe length is 30 m. (a) At a position in the pipe where the mean water temperature is 40°C, determine the heat loss and the pipe wall temperature. (b) If the pipe is covered with a 20-mm-thick layer...

A small diameter tube closed at one end was filled with benzene to within 20 mm...

A small diameter tube closed at one end was filled with benzene to within 20 mm from the top of the tube and maintained at 295 K and atm pressure of 100 kPa with a gentle stream of air blowing across the top. After 30 kilo-seconds (30 x 103 s) the liquid level has fallen to 25.8 mm. The vapor pressure of benzene at 295 K is 13.3 kPa. Calculate the diffusivity of benzene in air. Density of benzene =...

A hollow, round column has length (L = 1500 mm), outside diameter (do = 20 mm)...

A hollow, round column has length (L = 1500 mm), outside diameter (do = 20 mm) and inside diameter (di = 14 mm). If the column is made of steel (E = 207 GPa, Sy = 300 MPa), then determine if it is a Johnson or an Euler column and find the critical load Pcr for each of the following end-conditions: (a) Pinned-pinned (b) Fixed-pinned (c) Fixed-fixed (d) Fixed-free

What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter?

What is the resistance of a 2.9-m length of copper wire 1.4 mm in diameter? The resistivity of copper is 1.68×10-8Ω⋅m.

A straight rod of solid polymer is of length 1 m and diameter 10 mm. The...

A straight rod of solid polymer is of length 1 m and diameter 10 mm. The polymer is linearly viscoelastic with a tensile creep compliance given by: D = 2- exp(-0.1t); Gpa^-1 Where t is in hours. The rod is suspended vertically and a mass of 10 kg is hung from it for 10 hours. a) Find the change of length of the rod. b) Identify the time domain of this property test procedure.

A tube with a diameter of 6.45 mm was placed in a liquid with a density...

A tube with a diameter of 6.45 mm was placed in a liquid with a density of 998 kg / m3 and it was observed that the liquid increased by 1.44 mm in the tube. Find the surface tension of the fluid [N / m] by taking the contact angle 15 ° between the liquid and the tube surface.

Subjects