For external forced convection with an isothermal surface, what is the Nu# correlation equation for laminar flow if you are looking for total heat transfer?
Q: For a natural convection from the vertical plates, if Rayleigh number is given as 1 × 101º then the…
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Q: à heat transfer takes place by convection _with ficient of h = 60 W/m2 · °C. Calculate (a) the…
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Q: Q : Engine oil at 80°C flows over a 10-m-long flat plate whose temperature is 30°C with a velocity…
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Q: a) What is forced convection? How does it differ from natural convection? Is convection caused by…
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Q: a) What regions show the largest oceanic latent heat loss? b) What regions show the saltiest…
A: given; a) What regions show the largest oceanic latent heat loss? b) What regions show the saltiest…
Q: Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate with…
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Q: For internal forced convection, friction factor f can be found by using either the Moody charts, the…
A: The Moody chart or Moody diagram (also Stanton diagram) is a graph in a non-dimensional form that…
Q: ngine oil enters the 5 mm diameter pipe at 120°C. and the Re number is about 1000. Calculate the…
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Q: 3) Explain the difference between forced and free convection
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Q: 60°C glycerin flows over a 15m long flat plate with temperature of 20°C. The velocity of glycerin is…
A: Prandtl number is the only dimensionless number that is the property of the fluid. It is defined as…
Q: Hot water is being transported in a horizontal pipe (k = 0.15 W/m∙K, Di = 2.5 cm, Do = 4.5 cm),…
A: Given data Thermal conductivity of the pipe = 0.15W/mK Inner dia of pipe Di = 2.5 cm = 0.025m ri=…
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Q: and Surface temperature 4. In what functions does Nusselt number in natural convection differ from…
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Q: If forced convection uses Reynolds number to account for fluid movement during forced convection,…
A: Convection heat transfer: The heat transfer due to the motion of the fluid (air) is known as…
Q: QO What are the types of convection heat transfer?
A: Heat transfer takes place in three types 1. Conduction 2. Convection 3. Radiation
Q: 3n a manufacturing process, long aluminum rods of squaire cross section withd 21 mmare cooled from…
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Q: 24. Water at 80 F is flowing over a flat plate with a velocity of 8 ft/s. The plate is 5 ft long.…
A: Given: temperature of the water→T=80°F velocity of the water→v=8 fts=2.43 msec Length of the…
Q: Define the cooling of a boiled egg by forced and natural convection.
A: Rate of heat transfer by convection is given by Where h is convective heat transfer coefficient.…
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Q: (1) Explain the concept of convection heat transfer. What are the methods used for calculating the…
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Q: 1.0 Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate…
A: Given data: Film temperature = T = 300 K velocity = u = 1 m/s Distance from leading edge = x = 20 mm…
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Q: Differentiate between free and forced convection with examples.
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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: 6.18 Assuming a transition Reymolds number of 5 × 105, determine the distance from the leading edge…
A: Critical renoylds number is given asRec=ρu∞xcμxc=5×105μρu∞
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A: It will cool faster in case of warm air coming from lung.
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Q: A can of engine oil with a length of 150 mm and a diameter of 100 mm is placed vertically in the…
A: The data given is, Length of the can of engine oil, L = 150 mm = 0.150 m Diameter of the can 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 Fluid velocity = u = 1 m/s Fluids are : Air, Water, Engine…
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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…
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Q: Q5) For laminar free convection from a heated vertical surface, the local convection coeffi may be…
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Q: Water at a temperature of T∞= 25°C flows over one ofthe surfaces of a steel wall (AISI 1010) whose…
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Q: 1. Which is more effective in transferring heat by natural convection or forced convection?
A: In convection mode of heat transfer, heat transfer takes place by moving molecules or atoms of…
Q: -ood Luck! Thank you. If you want to cool a thin plate by natural convection quickly, will you hold…
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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
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- Topic: Heat transfer Completely solve and box the final answer. 1. A 20degC water flows to 50cmx60cm flat plate with velocity of 5.2m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?Mass flow rate of hot fluid is 0.007 kg/s. Convection heat transfer coefficient of hot fluid stream is 1000 W/m? °C. Thermophysical properties are given as follows. Hot fluid; c, = 5000 J/kg.°C Water; dynamic viscosity, u = 0.001 Pa.s; Prandtl number, Pr = 6.14; thermal conductivity, k = 0.607 W/m.°C; density, p = 1000 kg/m2; specific heat c, = 4200 J/kg.°C. Neglecting conduction resistance of the pipe, calculate heat exchanger effectiveness (ɛ), heat transfer rate (Q in J/s), outlet temperatures of the hot fluid (Th,out) and water (Tw.out) for varying mass flow rate values of water provided below. Mass flow rate of water, m (kg/s) 0.0025 0.01 0.025 0.05 0.075 0.1 Plot heat exchanger effectiveness (:), heat transfer rate (Q in J/s), outlet temperatures of the hot fluid (Thout) and water (Tw.out) as a function of water mass flow rate (m). Comment on the results. Hot fluid in (65 °C) Water Water in (25 °C) out d = 0.5 cm Hot fluid out L = 5 mQ2/ An aluminum sphere weighting 7kg and initially at a temperature of 533K is suddenly immersed in a fluid at 283K. if heat transfer coefficient between the sphere and fluid is 50W/m?.°C. Take density=2707kg/m3, specific heat=0.9KJ/kg.°C and thermal conductivity= 204W/m °C. إجابت * Determine the Bi number 0.00696 0.000696 0.0052 0.00052 0 أخری *.Determine the time required to cool sphere to 263K 26.28min 262.8min 52.56 min 525.6 min O أخری
- Mass flow rate of hot fluid is 0.007 kg/s. Convection heat transfer coefficient of hot fluid stream is 1000 W/m?.°C. Thermophysical properties are given as follows. Hot fluid; c, = 5000 J/kg.°C Water; dynamic viscosity, µ = 0.001 Pa.s; Prandti number, Pr = 6.14; thermal conductivity, k = 0.607 W/m.°C; density, p = 1000 kg/m³; specific heat c, = 4200 J/kg.°C. Neglecting conduction resistance of the pipe, calculate heat exchanger effectiveness (ɛ), heat transfer rate (Q in J/s), outlet temperatures of the hot fluid (Thout) and water (Tw.out) for varying mass flow rate values of water provided below. Mass flow rate of water, m (kg/s) 0.0025 0.01 0.025 0.05 0.075 0.1 Plot heat exchanger effectiveness (ɛ), heat transfer rate (Q in J/s), outlet temperatures of the hot fluid (Thout) and water (Tw.out) as a function of water mass flow rate (m .). Comment on the results. Hot fluid in (65 °C) Water Water in (25 °C) out d = 0.5 cm Hot fluid out L= 5 mMass flow rate of hot fluid is 0.007 kg/s. Convection heat transfer coefficient of hot fluid stream is 1000 W/m?.°C. Thermophysical properties are given as follows. Hot fluid; c, = 5000 J/kg.°C Water; dynamic viscosity, u = 0.001 Pa.s; Prandti number, Pr = 6.14; thermal conductivity, k = 0.607 W/m.°C; density, p = 1000 kg/m?; specific heat c, = 4200 J/kg.°C. Neglecting conduction resistance of the pipe, calculate heat exchanger effectiveness (ɛ), heat transfer rate (Q in J/s), outlet temperatures of the hot fluid (Th,out) and water (Tw,out) for varying mass flow rate values of water provided below. Mass flow rate of water, m„ (kg/s) 0.0025 0.01 0.025 0.05 0.075 0.1 Plot heat exchanger effectiveness (8), heat transfer rate (Q in Jis), outlet temperatures of the hot fluid (Th,out) and water (Tw,.cut) as a function of water mass flow rate (m„.). Comment on the results. Hot fluid in (65 °C) Water Water in (25 °C) out d = 0.5 cm Hot fluid out L= 5 mTopic: Heat transfer Completely solve and box the final answer. A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.72 W/m deg C, Re=3840000, and Pr=0.7)?
- Introduction to heat convection Solved problems HW-10- 1- Determine the velocity distribution in the velocity boundary layer assuming second degree polynomial: u =C, +C,y+C3y? Answer: The boundary conditions are: du .. u = 0 at y = 0 ; u = u, ; at y = 6 ; = 0 at y = 8 dy и y y This gives: 2.A certain liquid flow inside a 4 cm diameter pipe, 6 meter long with an entering temperature of 350 C. the wal temperature is maintained at 575 C, and the mass flow rate of the metal is 60 kg/min. p=6000 kg/m, Npr = 0.003, m = 0.003 N-s/m, k = 6.2 w/m-k, Cp = 0.41 kj/kg-k. what is the convection coefficient of the liquid (w/m-k)Q4/The outside wall of a building 6 m high receives an average radiant heat flux from the sun of 1100 W/m². Assuming that 95 W/m² is conducted through the wall, estimate the outside wall temperature. Assume the atmospheric air on the outside of the building is at 20°C. Ans. 170°C
- Q2/ An aluminum sphere weighting 7kg and initially at a temperature of 533K is suddenly immersed in a fluid at 283K. if heat transfer coefficient between the sphere and fluid is 50W/m?.°C. Take density=2707kg/m3, specific heat=0.9KJ/kg.ºC and thermal conductivity= 204W/m°C. Determine th Bi number and And determine the time required to cool sphere to 263kA: Air at 20 °C with convection heat transfer coefficient is 25 W/m². °C, blows over a hot plate (w 50 cm, L-75 cm, t- 2 cm thick, k-43 W/m. °C), if 300 W is lost from the plate surface by radiation. Calculate the inside plate temperature if the outside plate temperature is maintained at 250 °C.Air stream (k = 0.02439 W/m.K, v = * m2/s, Pr = 0.7336) flows over a flat surface [L= 4.5 m, w = 2.5 m] with velocity of 158 km/hr, flow is parallel to L, What is the average convective heat transfer Coefficient "W/m?.°C" ? 1.426 ×10 %3D