How is convection caused? Explain with an example?
Q: 2. A vertical square plate, 30cm on a side, is maintained at 50degC and exposed to room air at…
A: As per our guidelines we are supposed to solve only one question if multiple questions are asked .…
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Q: A black plate (e = 1) of dimensions 1 m x 1 m x 0.025 m is maintained at its top a temperature of…
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A: Given data: Diameter of the probe d = 0.5 m Rate of energy dissipate Ein.=150 W Emissivity ε=0.8…
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A: The temperatures in kelvin are,
Q: According to an Atomic Energy Commissionreport, a hydrogen bomb can be approximated as a large…
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Q: A spherical interplanetary probe of 0.5 m diameter contains electronics that dissipate 150 W. If the…
A: Calculate the surface area of the probe A= 4 πr2 4 π (0.5/2)2 =0.7854m2
Q: A solid sphere 1 of radius r is placed inside a nollow, closed hemispherical surface 2 of radius 4r.…
A: Given data as per question Diameter of surface 1=2r Diameter of surface 2 =8r F11+F12=1F12=1Because…
Q: A cylindrical bread at 145°C is cooling in air at 28°C. The loaf has 25 cm length and 7 cm radius.…
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Q: A circular grill of diameter 0.35 m and emissivity 0.7 is maintained at a constant surface…
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Q: Consider steady heat transfer between two large parallel plates at constant temperatures of T1=300 K…
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Q: ne-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient…
A: To given that Ambient temperture,T∞=20°C=293KSurrounding temperture,TSUR=40°C=313KConvection heat…
Q: 1. The dimensionless A. Prandtl number number not used in forced convection is: B. Reynolds number…
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Q: A vertical, double-pane window(square), which is 1 m on a side and has a 25-mm gap filled with…
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Q: Two large parallel plates having a gap of 10 mm in between them are maintained at temperatures 1000…
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Q: plane surfaces 1 and 2 - I, of 550 K and T, of 43 me that the distance betw eir dimensions.
A: Given data T1 = 550K T2= 430K Required Heat exchange
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Q: A small, thin metal plate of area A m² is kept insulated on one side and exposed to the sun on the…
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Q: Consider steady heat transfer between two parallel plates at a constant temperature
A: Given: T1=300 KT2=200 KL=2 cm=0.02 memmissitivity ε=1k=0.0219 W/mC To determine: The rate of heat…
Q: Using your own words and relevant equations, explain why the rate of heat transfer through…
A: The heat transfer through convection is faster than the rate of heat transfer through convection…
Q: Consider a thin suspended hotplate that measures 0.25 mx 0.25 m. The isothermal plate has a mass of…
A:
Q: A 25-cm circular grill has an emissivity of 0.9. The temperature of the air and surrounding surfaces…
A: To determine the heat transfer from the grill, first of all we need to determine the Reynold number…
Q: A cylindrical bread at 145°C is cooling in air at 28°C. The loaf has 25cm length and 7 cm radius.…
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Q: A circular plate of diameter (1.36 m) is placed some how 1.5 meter above the room floor, if the…
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A: The emissivity of the black surface is 1. The value of the Stefan-Boltzmann constant is 5.67×10-8…
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Q: Differentiate between free and forced convection with examples.
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Q: A circular grill of diameter 0.15 m and emissivity 0.7 is maintained at a constant surface…
A: Given: Diameter of the cricular grill D=0.15m Emissivity=0.7 Surface temperature Ts=137°C or 410K…
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A: Given Data Diameter, d=55 m Temperature, t1= -15oC, t2=35oC. Here, the volume of geodesic dome is,…
Q: Consider a thin suspended hotplate that measures 0.25 m x 0.25 m. The isothermal plate has a mass of…
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Q: Consider a thin suspended hotplate that measures 0.25 m x 0.25 m. The isothermal plate has a mass of…
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Q: Define convection and its types. Either free or forced convection is good by considering an example
A: The convection is a mode of heat transfer which occurs by the mass motion of a fluid such as air.…
Q: At the end of its manufacturing process, a silicon wafer of diameter d = 258 mm , thickness ô =1 mm…
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Q: Two parallel rectangular black plates 0.5 m by 2.0 m are spaced 1.0 m apart. One plate is maintained…
A: Given data: The area of rectangular plate is A=0.5×2=1 m2 The space between the plate is d=1 m The…
Q: :Define convection and its types. Either free or forced convection is good by considering an…
A: It is required to define convection and classify it
Q: An oil is acting as a lubricant for a pair of cylindrical surfaces such as those shown in The…
A: Given that, Speed of outer cylinder, N=7908 rpm,Radius of outer cylinder, ro=5.06 cm=0.0506…
Q: Explain why convection happens more often in gases and liquids than solids.
A: Convection is a mechanism of heat transfer taking place between two bodies by the movement of…
Q: Describe the physical mechanism of convection. How is the convection heat-transfer coefficient…
A: To Describe the physical mechanism of convection. How is the convection heat-transfer coefficient…
Q: Calculate the radiant heat loss per unit length, if the surface emissivity is 0.65.
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Q: In experimental aerodynamics, what is the difference between time-averaged and time- resolved…
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How is convection caused? Explain with an example?
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- Recent studies show that the major energy consumption in Fijian villages is wood which is used for cooking on open fires. Typical consumption of wood is 1 kg/person/day. (a) Estimate the heat energy required to boil a 2 litre pot full of water. Assuming this to be the cooking requirement of each person, compare this with the heat content of the wood, and thus estimate the thermal efficiency of the open fire. (b) How much timber has to be felled each year to cook for a village of 200 people ? Assuming systematic replanting, what area of crop must the village therefore set aside for fuel use if it is not to make a net deforestation ?Either free or forced convection is good by considering an example. please explainA food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at -30 ° C. The initial product temperature is 25 ° C. The pellet has a diameter of 1.2 cm, and a density of 980 kg / m³. The initial freezing temperature is -2.5 ° C. The latent heat of freezing of the product is 280 kJ / kg. The thermal conductivity of the frozen product is 1.9 W / (m ° C). The convective heat transfer coefficient is 40 W / (m² K). Calculate the freeze time. t f = Answer hour.
- Provide the answers with clear explantion and images. Coolant flowing through a radiator at the rate of 3 kg/s are cooled from 105 0C to 81 0 The specific heat capacity of coolant and air are 4.19 kJ/kg K and 1.13 kJ/kJ/K respectively. Th overall heat transfer coefficient from gas to water is 140 W/m2 K. Calculate the surface area required for the radiation if the vehicle speed is 100 km/h. Consider the density of air as 1.225 kg/m3.A food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at -30 ° C. The initial product temperature is 25 ° C. The pellet has a diameter of 1.2 cm, and a density of 980 kg / m³. The initial freezing temperature is -2.5 ° C. The latent heat of freezing of the product is 280 kJ / kg. The thermal conductivity of the frozen product is 1.9 W / (m ° C). The convective heat transfer coefficient is 40 W / (m² K). Calculate the freeze time. t f = hour.A food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at a temperature of -35 ° C. The initial product temperature is 25 ° C. The pellet has a diameter of 1 cm, and a density of 980 kg / m³. The initial freezing temperature is -2.5 ° C. The latent heat of freezing of the product is 280 kJ / kg. The thermal conductivity of the frozen product is 1.9 W / (m ° C). The convective heat transfer coefficient is 50 W / (m² K). Calculate the freeze time. t f = hour
- A food product wants to be produced in a small round shape (pellet) by freezing it in a water blast freezer freezer. Air freezer operates at -25 ° C. The initial product temperature is 25 ° C. The pellet has a diameter of 0.5 cm, and a density of 980 kg / m3. The initial freezing temperature is -2.5 ° C. The latent heat of freezing of the product is 280 kJ / kg. The thermal conductivity of the frozen product is 1.9 W / (m ° C). The convective heat transfer coefficient is 50 W / (m? K). Calculate the freeze time.For a specified heat input and a given volume which material will have the smallest tempera- ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be (a) slower at start and faster near the end (b) faster at start and slower near the end (c) both rates will be the same (d) this will depend on the material. (viii) A thin black plate at temperature T receives radiation from a surface at Temperature T1 and radiates to a surface at T2. If all surfaces are black at steady state (a) (T1 – T) > (T – T2) (b) (T1 – T) < (T – T2) (c) (T1 – T) = (T – T2) (d) can be any one of a, b or c. (ix) The temperature profile (in) a slab initially at a constant temperature and then allowed to cool by convection for a short time will be as shown in Fig : (a) E1.2a (b) E1.2b (c) E1.2c (d) E1.2d. TiAnswer Qb(i) and (ii) with detailed explanations
- please explain how the derivative first part clearlyUsing your own words and relevant equations, explain why the rate of heat transfer through convection is faster than the rate of heat transfer through conduction.A 7 cm diameter bed on a 25 cm long bed, as shown in the figure below. The shaft rotates at 3200 revolutions per minute with uniform intervals of 0.2 mm. Continuous operation The temperatures of the shaft and bearing adjacent to the oil gap are 55 0C. your oil viscosity 0.05 N.s/m2 and its thermal conductivity is 0.17 W/m.K. Continuity, momentum and by simplifying the energy equations and solving for each separately, a) The maximum temperature of the oil, b) Calculate the heat transfer rates to the bearing and shaft.