Homework Answers
In the laminar flow nusselt number is larger at entrance of pipe since heat transfer coefficient at entrance Is high due to high temperature gradient. As flow progresses nusselt number decreases.
Answer : option C
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Which of the following statements are true (could be multiple) for internal flow through a pipe?...
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperat...
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
1. (25 pts) Answer the following conceptual questions. Write down full explanations and derivations on a...
1. (25 pts) Answer the following conceptual questions. Write down full explanations and derivations on a clean piece of paper. h, 8 h(x) 80) 1 a. The effect of transition from laminar to turbulent flow on local velocity boundary layer thickness, 8(x) and local convection coefficient, h(x) for steady flow over an isothermal plate is illustrated in the following figure. Why does the convection coefficient decrease with x in the laminar region? How would the local heat flux change with...
(40 points) Engine oil flows at a rate of 1 kg/s through a 5-mm diameter smooth straight tube. Th...
(40 points) Engine oil flows at a rate of 1 kg/s through a 5-mm diameter smooth straight tube. The oil has an inlet temperature of 47°C and it is desired to heat the oil to a mean temperature of 87°C at the exit of the tube. The surface of the tube is maintained at 150°C. Assuming the flow is fully developed both hydrodynamically and thermally, determine the required length of the tube. Note: by calculating Reynolds number at the entrance...
Mechanical Engineering Heat Transfer chapter &(Internal Convection) will give a like. ONLY SO...
Mechanical Engineering Heat Transfer chapter &(Internal
Convection) will give a like.
ONLY SOLVE PART C and D
Problem 1 (Short Answer) Answer the following questions in 2-4 sentences a. Describe the features of the entrance region and the fully developed region of internal flow. b. Explain why the mean temperature changes along the axial direction in internal flow, while the free-stream temperature does not change in external flow. of constant heat flux and constant wall temperature. expect the velocity boundary...
2- (50 pts.) A fluid flow in a circular pipe is heated with a constant heat...
2- (50 pts.) A fluid flow in a circular pipe is heated with a constant heat flux. The pipe diameter is set to D=0.2 m and the length of the pipe to L = 1.0 m. The inlet temperature is 300 K and the inlet velocity is uniform. Use the following air properties: p= 1 kg/m?, u=4x10-5 Pa-s, k=0.03 W/m-K. The Reynolds number is Rep and the Prandtl number to Pr=1. A section of the pipe is heated with a...
State whether each statement below is True (T) or False (El. Use your best engineering judgment"....
State whether each statement below is True (T) or False (El. Use your best engineering judgment". 1. Phenomenological laws classify and describe phenomena based on observation of macroscopic behavior without explanation of microscopic behavior. 2. Fourier's Law of Heat Conduction states that the heat flux is directly proportional to the temperature gradient. 3. A "gray surface" absorbs the same magnitude of radiation as a “black surface". 4. A "black surface" surfaces emit less radiation than does a "gray surface". 5....
5) The following about turbulent flow in a pipe is true, EXCEPT a) The pipe cross-sectional...
5) The following about turbulent flow in a pipe is true, EXCEPT a) The pipe cross-sectional average velocity is half of the centerline velocity (i.e. V=0.5V.) b) The flow Reynolds number is beyond 4100 c) The flow consists of a viscous sublayer, a buffle layer (viscous and turbulent effect both important) and a fully turbulent region up to pipe centerline d) Reynolds-averaged (time mean) velocity is used to describe flow velocity
C) In compressible fluid flow through a smooth pipe with diameter d and constant volume flux...
C) In compressible fluid flow through a smooth pipe with diameter d and constant volume flux V 1. Estimate the viscous sublayer thickness. 2. Calculate the wall shear stress 3. Give the value of turbulent shear stress at the wall and at the pipe center. V-0.07854 m'/s, d-0.1m, V- 0.000001 m'/s, p- 1000kg/m3 Use the Prandtl equation to determine the friction factor
5) The following about turbulent flow in a pipe is true, EXCEPT a) The pipe cross-sectional...
5) The following about turbulent flow in a pipe is true, EXCEPT a) The pipe cross-sectional average velocity is half of the centerline velocity (i.e. V = 0.5V.) b) The flow Reynolds number is beyond 4100 c) The flow consists of a viscous sublayer, a buffle layer (viscous and turbulent effect both important) and a fully turbulent region up to pipe centerline d) Reynolds-averaged (time mean) velocity is used to describe flow velocity 6) The boundary layer (BL) theory does...
BIG UPVOTE FOR RIGHT ANSWER Viscous fluid flow 2nd edition Frank White I need answer of...
BIG UPVOTE FOR RIGHT ANSWER
Viscous fluid flow 2nd edition Frank White
I need answer of 2.17
I have attached 2.14 question and solution for reference.
2.17 As an extension of Prob. 2-14, consider the heat-transfer
aspect by assuming a uniform entrance profile T = To and an exit
profile approximated by T(r) = T0(1.5 + 0.5r2/ri). For flow with
constant (p, F, cp, k) and negligible kinetic- and potential-energy
changes, use the integral relations to compute the total heat...
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
Problem 1: Consider laminar pipe flow having a thermal entrance region and constant wall temperature. Suppose the average Nusselt number is given by the correlation: Nul 3.66+0.0668G 1+0.04Ga 2/3 1 Derive an expression for the local Nusselt number Nu,
1. (25 pts) Answer the following conceptual questions. Write down full explanations and derivations on a clean piece of paper. h, 8 h(x) 80) 1 a. The effect of transition from laminar to turbulent flow on local velocity boundary layer thickness, 8(x) and local convection coefficient, h(x) for steady flow over an isothermal plate is illustrated in the following figure. Why does the convection coefficient decrease with x in the laminar region? How would the local heat flux change with...
(40 points) Engine oil flows at a rate of 1 kg/s through a 5-mm diameter smooth straight tube. The oil has an inlet temperature of 47°C and it is desired to heat the oil to a mean temperature of 87°C at the exit of the tube. The surface of the tube is maintained at 150°C. Assuming the flow is fully developed both hydrodynamically and thermally, determine the required length of the tube. Note: by calculating Reynolds number at the entrance...
Mechanical Engineering Heat Transfer chapter &(Internal
Convection) will give a like.
ONLY SOLVE PART C and D
Problem 1 (Short Answer) Answer the following questions in 2-4 sentences a. Describe the features of the entrance region and the fully developed region of internal flow. b. Explain why the mean temperature changes along the axial direction in internal flow, while the free-stream temperature does not change in external flow. of constant heat flux and constant wall temperature. expect the velocity boundary...
2- (50 pts.) A fluid flow in a circular pipe is heated with a constant heat flux. The pipe diameter is set to D=0.2 m and the length of the pipe to L = 1.0 m. The inlet temperature is 300 K and the inlet velocity is uniform. Use the following air properties: p= 1 kg/m?, u=4x10-5 Pa-s, k=0.03 W/m-K. The Reynolds number is Rep and the Prandtl number to Pr=1. A section of the pipe is heated with a...
State whether each statement below is True (T) or False (El. Use your best engineering judgment". 1. Phenomenological laws classify and describe phenomena based on observation of macroscopic behavior without explanation of microscopic behavior. 2. Fourier's Law of Heat Conduction states that the heat flux is directly proportional to the temperature gradient. 3. A "gray surface" absorbs the same magnitude of radiation as a “black surface". 4. A "black surface" surfaces emit less radiation than does a "gray surface". 5....
5) The following about turbulent flow in a pipe is true, EXCEPT a) The pipe cross-sectional average velocity is half of the centerline velocity (i.e. V=0.5V.) b) The flow Reynolds number is beyond 4100 c) The flow consists of a viscous sublayer, a buffle layer (viscous and turbulent effect both important) and a fully turbulent region up to pipe centerline d) Reynolds-averaged (time mean) velocity is used to describe flow velocity
C) In compressible fluid flow through a smooth pipe with diameter d and constant volume flux V 1. Estimate the viscous sublayer thickness. 2. Calculate the wall shear stress 3. Give the value of turbulent shear stress at the wall and at the pipe center. V-0.07854 m'/s, d-0.1m, V- 0.000001 m'/s, p- 1000kg/m3 Use the Prandtl equation to determine the friction factor
5) The following about turbulent flow in a pipe is true, EXCEPT a) The pipe cross-sectional average velocity is half of the centerline velocity (i.e. V = 0.5V.) b) The flow Reynolds number is beyond 4100 c) The flow consists of a viscous sublayer, a buffle layer (viscous and turbulent effect both important) and a fully turbulent region up to pipe centerline d) Reynolds-averaged (time mean) velocity is used to describe flow velocity 6) The boundary layer (BL) theory does...
BIG UPVOTE FOR RIGHT ANSWER
Viscous fluid flow 2nd edition Frank White
I need answer of 2.17
I have attached 2.14 question and solution for reference.
2.17 As an extension of Prob. 2-14, consider the heat-transfer
aspect by assuming a uniform entrance profile T = To and an exit
profile approximated by T(r) = T0(1.5 + 0.5r2/ri). For flow with
constant (p, F, cp, k) and negligible kinetic- and potential-energy
changes, use the integral relations to compute the total heat...
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