nat are the darrerences beween velocity boundary layer and thermal boundarylayer? scuss about both boundary layers including the characteristics, the profiles and etors affecting the boundary layers.
Q: Consider the following fluids at a film temperature of 300 Kin parallel flow over a flat plate with…
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Q: Air at 20oC and 1 atm flows over a flat plate at 35 m/s. The plate is 75 cm long and 100 cm depth…
A: Velocity boundary layer thickness The thickness of the velocity boundary layer is normally defined…
Q: a) What is forced convection? How does it differ from natural convection? Is convection caused by…
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Q: Calculate the ratio of thermal-boundary-layer thickness to hydrodynamic-boundary- layer thickness…
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Q: Consider a hot rectangular plate positioned vertically at constant temperature Ts in quiescent air.…
A: For solution refer below images.
Q: 7-92 Air at 20°C (1 atm) is flowing over a 5-cm-diameter sphere with a velocity of 3.5 m/s. If the…
A: Given DataT∞=20°CTs=80°CV=3.5m/sD=5cm
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A: Nusselt number (Nu) signifies the ratio of conductive resistance to the convective resistance…
Q: he water surface temperature at 20 ° C is kept constant at 80 ° C, 1 m wide and 3.6 m long It flows…
A: Temperature of water is = 20 degrees Plate is maintained at a temperature of 80 degrees Dimensions…
Q: 9-26 A 0.5-m-long thin heat flux on one side, w air at 5°C. The plate surf midpoint temperature is…
A: mean fluid temp = ( tmid+ text)/2 = 30 degrees
Q: Air at 27 ⁰C and 1 atm flows over a flat plate at a velocity of 3m/s, assuming the plate is heated…
A: Given details in question: T1=27°cT2=60°cV=3m/secl=25 cm Reynolds number: Re=Vlν Average Nusselt…
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Q: Q9) Consider a 50 cm diameter and 95 cm long hot water tank. The tank is placed on the roof of a…
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Q: nvection. (a) is thinner than the hydrod
A: given: For the fluid flowing over a flat plate with Prandtl number greater than unity, the thermal…
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Q: 3. (a) Discuss, the concepts of velocity boundary layer and temperature boundary layer. Provide some…
A: Velocity Boundary Layer; when a fluid flows over a stationary surface, e.g. the flat plate, the bed…
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A: Solution:
Q: The heat transfer from a 2-m-diameter sphere to a 25 °C air stream over a time interval of one hour…
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Q: Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with…
A: Given: The temperature of fluid, T = 300 K The speed of fluid, v = 1 m/s The distance from leading…
Q: Consider a flat plate subject to parallel air flow (top and bottom) characteriz s, Too = 20°C with…
A: GivenT∞=20°CTs=80°CL=2mw=2mU∞=5
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Q: A hot fluid (kfluid = 0.72 W/m∙K) is flowing as a laminar fully-developed flow inside a pipe with an…
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Q: For fluids with small Prandt number the thermal boundary layer development is much choose your…
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Q: Air is flowing in parallel over the upper surface of a flat plate with a length of 4m. The first…
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Q: DO first case, Rex, = 5 × 10³, while in the second case the flow is tripped to a tu e the thermal…
A: V = 1.5 m/sT∞ =45°CTs = 20°CRex,c = 5 × 105x = 0m To-Determine:- x = ____mqlam'' = ____ W/m2qturb''…
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A: It will cool faster in case of warm air coming from lung.
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Q: Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with…
A: Given dataFilm temperature = 300 KFlow velocity = u = 1 m/sWe have to find the velocity and thermal…
Q: hat of the velocity boundary
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Q: iB swionnoed by A UOcmo8Ocm vertical plate 26°C air and the temprature of the plate is 20L, Compare…
A: Given DataTα=26°CTs=50°C
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A: Convection Convection is a mechanism of energy transmission that combines the combined effects of…
Q: Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with…
A: Given data: Film Temperature = Tf = 300 K Velocity of flow = u = 1 m/s x = distance from leading…
Q: In flow over a surface, velocity and temperature profiles are of the forms u(y) = Ay + By? + Cy3 and…
A: Note- due to company policy i can provide you only one answer if you want to answer outher…
Q: Consider a flow over a surface with the velocity and temperature profiles given as u(v) = C1 (y + y²…
A: Given Data
Q: Water at 43.3°C flows over a large square plate at a velocity of 21 cm/s. The plate is 1.9 m long…
A: Reynolds number is calculated for V=.21 m/s. Nusselt number are found and from here H is calculated.…
Q: Required information Hot engine oil at 150°C is flowing in parallel over a flat plate at a velocity…
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Q: In experimental aerodynamics, what is the difference between time-averaged and time- resolved…
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Q: Caster oil at 36°C flows over a 6 m long and 1 m wide heated plate at 0.06 m/s. For a surface…
A: The answer is given below
Q: With the aid of diagram(s), discuss the variation of heat transfer coefficient with distance over a…
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Q: How could updrafts and downdrafts contribute to cloud droplet or ice crystal growth?
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Q: A 10-cm-diameter, 30-cm-high cylindrical bottle contains cold water at 3°C. The bottle is placed in…
A: Given:- Diameter of bottle=10cm height=30cm temp of cold water =3°C temp of air=27°C temp of water…
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- 5.7 The average Reynolds number for air passing in turbulent flow over a 2-m-long, flat plate is . Under these conditions, the average Nusselt number was found to be equal to 4150. Determine the average heat transfer coefficient for an oil having thermal properties similar to those in Appendix 2, Table 18, at at the same Reynolds number and flowing over the same plate.Determine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.An electrical transmission line of 1.2-cm diameter carries a current of 200 amps and has a resistance of 310-4 ohm per meter of length. If the air around this line is at v, determine the surface temperature on a windy day, assuming a wind blows across the line at 33 km/h.
- . Castor oil at 36 °C flows over a 6 m long and 1 m wide heated plate at 0.06 m/s. For a surfacetemperature of 96 °C, determine (i) the thermal boundary layer thickness at the end of the plate,(ii) the local heat transfer coefficient at the end of the plate, and (iii) the rate of heat transfer fromthe entire plateAir is flowing in parallel over the upper surface of aflat plate with a length of 4 m. The first half of the plate length,from the leading edge, has a constant surface temperatureof 50°C. The second half of the plate length is subjected toa uniform heat flux of 86 W/m2. The air has a free streamvelocity and temperature of 2 m/s and 10°C, respectively.Determine the local convection heat transfer coefficients at1 m and 3 m from the leading edge. Evaluate the air propertiesat a film temperature of 30°C. Is the film temperatureTf = 30°C applicable at x = 3 m?Consider a 50-cm-diameter and 95-cm-long hot water tank. The tank is placed on the roof ofa house. The water inside the tank is heated to 80℃ by a flat-plate solar collector during theday. The tank is then exposed to windy air at 18℃ with an average velocity of 40 km/h duringthe night. Estimate the temperature of the tank after a 45-min period. Assume the tank surfaceto be at the same temperature as the water inside, and the heat transfer coefficient on the topand bottom surfaces to be the same as that on the side surface. Evaluate the air properties at50℃. (Answer: 69.9 ℃)
- Air is flowing in parallel over the upper surface of a flat plate with a length of 4 m. The first half of the plate length, from the leading edge, has a constant surface temperature of 50°C. The second half of the plate length is subjected to a uniform heat flux of 86 W/m2. The air has a free stream velocity and temperature of 0.5 m/s and 10°C respectively. The properties of air at Tf = 30°C are k = 0.02588 W/m∙K, ν = 1.608 × 10−5 m2/s, and Pr = 0.7282. Determine the local convection heat transfer coefficients at 1 m and 3 m from the leading edge.Air is flowing in parallel over the upper surface of a flat plate with a length of 4 m. The first half of the plate length, from the leading edge, has a constant surface temperature of 50°C. The second half of the plate length is subjected to a uniform heat flux of 86 W/m2. The air has a free stream velocity and temperature of 0.5 m/s and 10°C respectively. The properties of air at Tf = 30°C are k = 0.02588 W/m∙K, ν = 1.608 × 10−5 m2/s, and Pr = 0.7282.Determine the local convection heat transfer coefficients at 1 m from the leading edge.How can we use the transient temperature charts when the surface temperature of the geometry is specified instead of the temperature of the surrounding medium and the convection heat transfer coefficient?
- Define and explain the physical significance of the following:(a)prandtl number(b) Reynolds number (c)Nusselt number In which mode of heat transfer is the convection heat transfer coefficient usually higher, natural convection or force convection?why?Air at 1 atm 5°C with a free-stream velocity of 2 m/s flows in parallel with a stationary thin 1x 1m^2 flat plateover the top and bottom surfaces. The flat plate has a uniform surface temperature of 35°C. Determine theaverage convection heat transfer coefficient. (Answer: 5.46 W/m2·K)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?