Qs Air at 1 atm and 40°C flows across a 10 cm diameter cylinder at velocity of 40 m/s. The cylinder surface is maintained at 120 °C. Determine the heat loss per unit length of the cylinder. Pair=1.4225Kair= 0.383. K.Hair-2.57 x 10-scp = 1.025; kg.K Use Nua= 0.3+ 0.62Re / Pr¹/3 (1+(0.APP) x (1+ 5%)" Red 282000/
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- 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)= 2562 J/kg.k, Pr 51.3, µ = 5.22E-3 Pa.s, k 0.260 W/m.K" flows at 0.9 kg/min inside a 3-mm diameter, thin- walled tube. The tube is coiled and Hot fluid %3D %3D %3D 00 submerged in a water bath maintained at 23°C. The fluid experiences a temperature drop of 65°C and leaves the tube at 35°C. What is the required length of the tube "m"? Neglect heat transfer · enhancement associated with the coiling. Assume fully developed flow, if turbulent flow use Dittus, Boelter equation: Nu = 0.023 Re 71 Pr. Select one: A. 18.40 B. 20.07 C. 21.98 D. 23.90 O E. 25.33 S PAGE NEXT PAGE nationQ1: In a process water at 30°C flows over a plate maintained at 10 °C with a free stream velocity of 0.3 m/s. Determine the hydrodynamics boundary layer thickness, thermal boundary layer thickness, local and average values of heat transfer coefficient and refrigeration necessary to maintain the plate temperature. Consider a plate of 1m x 1m size. At the film temperature the property values are: Kinematic viscosity 1.006 x 106 m²/s, Thermal conductivity =0.5978 W/m.K, Prandtl number=7.02. =
- 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.°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 أخریTopic: 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?A vertical pipe 90 mm diameter and 2.5 m height is maintained at a constant temperature of 125 o The pipe is surrounded by still atmospheric air at 25 oC. Find heat loss by natural convection. Properties of water at 75 oC: Density = 1.0145 kg/m3 Kinematic viscosity = 20.55 x10-6 m2/s Prandtl number (Pr) = 0.693 Thermal conductivity (k) = 30.06 x 10–3 W/m K
- The air at 1 ATM and 35⁰c flow through a cylinder 5 cm in diameter,at Velocity 50 cm/s. The surface temperature of the cylinder is guarded at 150⁰c *)Calculating heat loss per cylinder unitDuring air cooling of oranges, grapefruit, andtangelos, the heat transfer coefficient for combined convection,radiation, and evaporation for air velocities of0.11 < V < 0.33 m/s is determined experimentally and isexpressed as h = 5.05 kair Re1/3/D, where the diameter Dis the characteristic length. Oranges are cooled by refrigeratedair at 5°C and 1 atm at a velocity of 0.3 m/s. Determine(a) the initial rate of heat transfer from a 7-cm-diameterorange initially at 15°C with a thermal conductivity of0.50 W/m·K, (b) the value of the initial temperature gradientinside the orange at the surface, and (c) the value of theNusselt number.A brass rod 125.00 mm long and 5.00 mm in diameter extends horizontally from a casting at 200°C. The rod is in an air environment with T = 20°C and h = 30W/m2.K. What is the temperature of the rod 31.25, 62.50, and 125.00 mm from the casting? T31.25 = i °C T62.50 = i °C T125.00 i °C %3D
- A liquid is heated from 20 to 70 oC as it flows at 0.025 kg/s through a steel tube of 10 mm and 12m long. A uniform heat flux is maintained on the tube surface. Using the following liquid properties ρ = 1000 kg/m3, Cp = 4100 J/kg.K, k = 0.45 W/m.K, Pr = 10, μ = 2x10-3 kg/s.m. Calculate the average heat flux on the tube. Calculate the heat transfer coefficient at end of tube Calculate the surface temperature at exit and the heat transfer coefficient for first 1m of pipe?Need answer ASAP! Thank you Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. Thewater flow over the surface of the apple creates a convective heat-transfer coefficientof 10 W/(m2-K). Assume the apple can be described as a sphere with an 8 cm diameterand the geometric center is to be reduced to 10°C. The apple properties include thermalconductivity of 0.4 W/(m-K), specific heat of 3.950 kJ/(kg-K), and density of 940 kg/m3 a. Determine the time that the apples must be exposed to the water.b. If the apple is submerged only for 2 hours, what will be its center temperature?A stainless steel rod (AISI 304) of length L = 100 mm and triangular cross section is attached between two isothermal heat sinks at T(x = 0) = T(x = L) = 50°C. The rod perimeter is P = 4.25 mm. When an unknown fluid at T = 23°C is in cross flow over the rod, the temperature of the rod midway between its two ends is measured to be T(x = 0.5L) = 25°C. Determine the value of the convection heat transfer coefficient, in W/m2.K, and the rate of heat loss from the rod, in W. Evaluate the properties of the stainless steel at T = 310 K. h = 9f= W/m².K W