Consider laminar flow of air across a hot circular cylinder. At what point on the cylinder will the heat transfer be highest? What would your answer be if the flow were turbulent?
Q: Q1: Consider a hot automotive engine, which can be approximated as 0.40m wide, and 0.8m long…
A: Given Data The speed of the car is: γ=80 km/h=22.22 m/s The length of the engine block is: L=0.8 m…
Q: rite the definition ,formula and significance of Reynolds number and Grashoff number in convection…
A: Given: Reynolds number Grashoff number To write: The formula, definition and significance of in…
Q: Q) Water at 22'C flows in a 40-cm-diameter pipe and 25-m-long at an average velocity of 0.15 m/s.…
A:
Q: What is natural convection? How does it differ from forced convection? What force causes natural…
A: Heat transfer can take place in three different modes namely conduction, convection and radiation.…
Q: 1- Air at 288.8 k and 101.32 kPa with a free stream velocity of 3.05 m/s is flowing parallel to a…
A: Given:
Q: Q3: Air flows across a 20-cm-square plate with a velocity of 5 m/s. Free-stream conditions are 10 C…
A: In general, there are three modes by which heat gets transferred from one place to another. The…
Q: A long 10-cm-diameter steam pipe whose external surface temperature is 110°C passes through some…
A: In order to proceed with the problems some assumptions need to be considered. Steady operating…
Q: What happens to the heat transfer coefficient in convection heat transfer if the viscosity of the…
A: Viscosity: The resistance to flow of any fluid is known as viscosity. The viscosity of any fluid is…
Q: Glycerin is being heated by flowing between two parallel 1-m-wide and 10-m-long plates with 12.5-mm…
A: Given: The width of the plate, w = 1 m The length of the plate, L = 10 m The spacing of plates, t =…
Q: What does the friction coefficient represent in flow over a flat plate? How is it related to the…
A: Drag force is a force acting on a body (moving or stationary)which is present in a moving or…
Q: During a cold winter day, wind at 55 km/h is blowing parallel to a 4m high and 10m long wall of a…
A:
Q: Hot engine oil at 150°C is flowing in parallel over a flat plate at a velocity of 2 m/s. Surface…
A: Given data Temperature of hot engine oil To = 1500C = 423K Velocity of oil flow V = 2m/s Length of…
Q: Why is heat transfer faster in forced convection compared to natural convection
A: Natural convection: when heat transfer is taking place due to motion of fluid caused by density…
Q: Air at 30 oC flowing over a flat plate 0.5 m long and 0.6 m wide, is to be maintained at 70 oC .…
A: This question is solved with the help of the convection heat transfer coefficient equation. As shown…
Q: Thick fluids such as asphalt and waxes and the pipes in which they flow are often heated in order to…
A:
Q: Air is flowing in parallel over the upper surface of a flat plate with a length of 4 m. The first…
A: The value of kinematic viscosity, v = 1.608×10-5 m2s Thermal conductivity, k = 0.02588 Wm·K Prantl…
Q: Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates. The gas at 220°C flow is…
A:
Q: What is heat transfer coefficient?
A: The heat transfer constant or film constant, or film effectiveness, in physical science and in…
Q: A long 8-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open…
A: Given data diameter of the pipe D = 8 cm = 0.08m External surface temperature of the pipe Ts = 900C…
Q: Liquid mercury at 250°C is flowing with a velocity of 0.3 m/s in parallel over a 0.1-m-long flat…
A: The data given is, The temperature of liquid Mercury = 250 ℃ The velocity of flow, V = 0.3 m/s…
Q: Hot carbon dioxide exhaust gas at 1 atm is being cooled by flat plates as shown in Fig 3. The gas at…
A:
Q: Engine oil at 83°C flows over the upper surface of a 5-m-long flat plate whose temperature is 18°C…
A:
Q: When is heat transfer through a fluid conduction and when is it convection? For which case is the…
A: The rate of heat transfer is given
Q: What regime favors heat transfer and why? Laminar, Turbulent or Transitional
A: Heat transfer is basically a process in which the molecules are moved from their initial position in…
Q: Consider a hot baked potato. Will the potato cool faster or slower when we blow the warm air com ing…
A: It will cool faster in case of warm air coming from lung.
Q: Air (1 atm) entered into a 5-mm-diameter circular tube at an average velocity of 5 m/s. The tube…
A: Given data, The length of the tube, L = 10 cm The diameter of the tube, d = 5 mm The velocity of…
Q: Consider steady, laminar, two-dimensional flow over a hot plate. Does the convective heat transfer…
A: Given: Consider steady, laminar, two-dimensional flow over a hot plate The wall shear stress is…
Q: what are the different modes of heat transfer? Explain transfer of heat by convection process?
A:
Q: Air is flowing in parallel over the upper surface of a flat plate with a length of 4 m. The first…
A: The velocity of free stream is V=0.5 m/s. The temperature of air is T∞=100C. The kinematic viscosity…
Q: Define and explain the physical significance of the following:(a)prandtl number(b) Reynolds number…
A:
Q: What does the Grashof number represent? How does the Grashof number differ from the Reynolds number?
A: Grashof number is a dimension less number. Which we use in heat transfer and fluid mechanics.
Q: When the convection heat transfer coefficient is very large (h → ∞), the convection resistance…
A: When the convection heat transfer coefficient is very large (h → ∞), the convection resistance…
Q: Q) Water at 22°C flows in a 40-cm-diameter pipe and 25-m-long at an average velocity of 0.15 m/s.…
A:
Q: Consider a person walking first in the air and then in the water at the same speed. Which motion…
A:
Q: Consider a fluid with a Prandtl number of 7 flowing through a smooth circular tube. Using the…
A: Now, consider the value of Reynold’s Number as 3500, the Nusselt numbers are calculated by given…
Q: Consider a refrigeration truck traveling at 55 mph at a location where the air temperature is 80°F.…
A: The data given is, Size of the refrigerated compartment = 9 ⨯ 8 ⨯ 20 = 1440 ft3 Length of…
Consider laminar flow of air across a hot circular
cylinder. At what point on the cylinder will the heat transfer
be highest? What would your answer be if the flow were turbulent?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps with 3 images
- 7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?Consider a hot baked potato. Will the potato cool faster or slower when we blow the warm air com ing from our lungs on it instead of letting it cool naturally in the cooler room air? Briefly explain your answer.Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516×10-5 0.7309 25°C 0.02551 1.562x105 0.7296
- Determine the convection heat transfer coefficient (in W/m²-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x105 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x105 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round vour answer to2 decimal nlacesDetermine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x10-5 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places.Determine the convection heat transfer coefficient for the flow of (a) air and (b) water at a velocity of 2 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.
- Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 8 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 30°C and leaves at 20°C, i.e. air is cooled. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x10-5 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places. Add vour answerDetermine the convection heat transfer coefficient (in W/m?.K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x105 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places.Determine the convection heat transfer coefficient for the flow of (a) fluid A and (b) fluid B at a velocity of 2 m/s in a 10-cm diameter and 10-m long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C.
- Electronic components are attached under a thin square plate and the all the energy dissipated by components is removed by water flow over the top surface. The plate length is 0.18 m and the thermophysical properties of water may be approximated as: k = 0.620 W/mK, Pr = 5.2, ν = 0.96x10-6 m2/s Water flow velocity is 1.5 m/s and the amount of dissipated energy (q’’) from the components can be estimated as uniformly distributed heat flux of 80000 W/m2. One approach to analyze this problem is to assume the plate has an isothermal temperature as a boundary condition. Calculate the average isothermal plate temperature in °C for the given conditions blank If the boundary layer is ‘tripped’ and the flow over the plate is completely turbulent; what will be the average isothermal plate temperature in °C for this case?Convection 2. For a boiling process such as shown in Figure below, the ambient temperature Tin Newton's law of cooling is replaced by the saturation temperature of the fluid Tsat. Consider a situation where the heat flux from the hot plate is q=20 x 105 W/m². If the fluid is water at atmospheric pressure and the convection heat transfer coefficient is hw=20 x 103 W/m2 K, determine the upper surface temperature of the plate, Ts, w. In an effort to minimize the surface temperature, a technician proposes replacing the water with a dielectric fluid whose saturation temperature is Teat, d=52 °C. If the heat transfer coefficient associated with the dielectric fluid is h = 3 x 103 W/m2 K, will the technician's plan work?Q2: Determine the convection heat transfer coefficient for the flow of (a) air and (b) water at a velocity of 5 m/s in an 8-cm-diameter and Water 10-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. or Air 5 m/s D=8 cm L= 10