Consider a long horizontal cylindrical pipe of external diameter 10 mm that is losing heat by...
Consider a long horizontal cylindrical pipe of external diameter 10 mm that is losing heat by convection to still air at 0oC. If the external surface of the pipe has a uniform temperature of 80oC, determine the rate of convection heat transfer per unit length of the pipe. The following properties may be assumed for air: = 1.127 kg·m-3 , k = 0.02665 W·m-1 ·K -1 , = 1.702 x 10-5 m2 ·s-1 , Pr = 0.724.
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Consider a long horizontal cylindrical pipe of external diameter
10 mm that is losing heat by...
(c) Steam flows a pipe of external diameter 30 mm, where the pipe outer surface temperature...
(c) Steam flows a pipe of external diameter 30 mm, where the pipe outer surface temperature is 130oC. Circular annular fins (k = 180 W·m-1·K-1) of outer diameter 60 mm and thickness 1 mm are fitted tightly to the pipe. Heat is transferred by convection (h=10 W·m-2·K-1) to the surrounding air at 20oC. (i) Determine the efficiency of a single fin. (ii) Determine the heat transfer rate for a single fin. (8 marks) (6 marks) (iii) Determine the effectiveness of...
A) Determine the convection heat transfer coefficient for the flow of air. [W/m2·°C] B) Determine the...
A) Determine the convection
heat transfer coefficient for the flow of air.
[W/m2·°C]
B) Determine the convection heat transfer coefficient for water.
[W/m2·°C]
The velocity of the fluid is 9 m/s in an 8-cm diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. Water or Air D 8 cm L=7 m Given: The properties of air at 25°C are: k 0.02551 W/m."C v 1.562 10-5 m2/s Pr =...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water...
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with T; = 20°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe, so that the fluid exits at 60°C. Assuming fully developed flow and taking the average fluid properties to be p = 992.1 kg/m2, k = 0.631 W/m-°C, Cp =...
A 10 m long stainless steel (AISI 347) pipe is delivering saturated liquid water at 140...
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6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water i...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
QUESTION 1 (10 marks) a) Write the Newton's law of heat convection in fluid using convection heat transfer coef...
QUESTION 1 (10 marks) a) Write the Newton's law of heat convection in fluid using convection heat transfer coefficient, h (Wm2.K). Please explain the equation in terms of its driving force and resistancC (2 marks) (POUCOI/C2) b) Define the heat transfer rate, q,by inside and outside convection and wall conduction considering a stainless steel cylindrical pipe (inside radius, ri and outer radius, ) with fiberglass insulator (radius, s) in ą steady state condition as shown in Figure Q11 Steam with...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and an outer diameter of D2 = 32 mm. The thermal conductivity of the pipe wall is 12 W/m·K. The inner surface of the pipe is coated with thin polyvinylidene chloride (PVDC) lining. Along a length of 1 m, the pipe outer surface is exposed to convection heat transfer with hot gas, at T∞ = 100°C and h = 5 W/m2·K, and thermal radiation with...
4. A pure copper pipe with inner diameter Di-10 mm ard outer diameter Do-14 mm is surrounded by s...
4. A pure copper pipe with inner diameter Di-10 mm ard outer diameter Do-14 mm is surrounded by saturated steam with pressure p 172 bar and convection coefficient h 6000 carries water with mean velocity u- (a) Determine the convective heat transfer coefficient inside the pipe for water at mean temperature Tm 37° C (b) At this same location, determine the total thermal resistance (per unit length) between the water and the steam. (c) Determine the heat transfer rate (per...
A) Determine the convection
heat transfer coefficient for the flow of air.
[W/m2·°C]
B) Determine the convection heat transfer coefficient for water.
[W/m2·°C]
The velocity of the fluid is 9 m/s in an 8-cm diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. Water or Air D 8 cm L=7 m Given: The properties of air at 25°C are: k 0.02551 W/m."C v 1.562 10-5 m2/s Pr =...
A long cylindrical rod of diameter 220 mm with thermal conductivity 0.5 W/m-K expe riences uniform volumetric heat generation of 25,000 W/m3. The rod is encapsulated by a circular sleeve having 7 W/m K. The outer surface of the sleeve is exposed to cross flow of air at 25°C with a convection coefficient of 25 W/m2-K. Find the temperature at the interface between the rod and sleeve, and on the outer surface. an outer diameter of 410 mm and thermal...
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
QUESTION 5 A 12-m-long and 11-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with T; = 20°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped around the outer surface of the pipe, so that the fluid exits at 60°C. Assuming fully developed flow and taking the average fluid properties to be p = 992.1 kg/m2, k = 0.631 W/m-°C, Cp =...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
QUESTION 1 (10 marks) a) Write the Newton's law of heat convection in fluid using convection heat transfer coefficient, h (Wm2.K). Please explain the equation in terms of its driving force and resistancC (2 marks) (POUCOI/C2) b) Define the heat transfer rate, q,by inside and outside convection and wall conduction considering a stainless steel cylindrical pipe (inside radius, ri and outer radius, ) with fiberglass insulator (radius, s) in ą steady state condition as shown in Figure Q11 Steam with...
4. A pure copper pipe with inner diameter Di-10 mm ard outer diameter Do-14 mm is surrounded by saturated steam with pressure p 172 bar and convection coefficient h 6000 carries water with mean velocity u- (a) Determine the convective heat transfer coefficient inside the pipe for water at mean temperature Tm 37° C (b) At this same location, determine the total thermal resistance (per unit length) between the water and the steam. (c) Determine the heat transfer rate (per...
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