An object of characteristic length Z = 0.5 m is 10°C warmer than the surrounding fluid, which is flowing at a velocity of 0.5 m/s. Determine the Reynolds number, the Grashof number, and the ratio Gr/Re, for Ty =80°C, where Ty is the film temperature, Consider the fluid to be either air at atmospheric pressure or liquid water. Grair Rezair 1.1066 11468.73165 (Gry/Re) 0.54804 Gri,water 3.750 Rewater 684380.28 (Gry/Re) water 0.008
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- Completely solve and box the final answer. Write legibly 2. Calculate the convective heat transfer in KW from air to the circular tube 7.7 meter long with an inside diameter of 127.7 mm. Tube’s temperature along the entire length is 27.7ºC. The average temperature of hot air flowing through the tube is 127.7ºC. Convective film coefficient is 27.7 W/m2-ºK.Air at 30 °C and 1 atm is flowing over a long flat plate with a velocity of 10 m/s. Its corresponding kinematic viscosity (y) is 1.5625x10 m2/s. The distance from the leading edge of the plate where the flow becomes turbulent is V. Oa. 1m Ob. 0.976 m 0.781 m Od.1242 mWhat is the Reynolds number of a fluid flowing in a tube with an inside diameter of 1 inches? The viscocity is 1.353 x 10^ -5 lb/ft-s and the mass flow rate is 79 lb/h.Correct Answer: 24,780.96 ± 1%
- Air at 10 m/s is flowing over a cylinder of D=(1) cm and L = 1 m. Air has thermalconductivity 0.027 W/mK, kinematic viscosity 1.9*10-5 m2/s, and Prandtl number 0.72.Find the Nusselt number uses charts/table also if neededQ1: 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. =As a process engineer, you are designing a new drinking water treatment plant using conventional treatment process including Two Trains of Flocculators as follows: The design flow is 0.35 m³/s. The average temperature of water is 5°C with a dynamic viscosity, μ = 1.519 x 10-3 Pa.S and p = 999.967 kg/m³. The major target of the WTP is to remove color from water using alum as coagulant. GAvg 0 = 120,000. In each train of flocculators, it includes three same size compartments in series with the tappered velocity gradients G: 80, 50, and 20 Sec-¹. Length = Width = Depth for each Comparment. The type of impeller is axial-flow with three blades. The available impeller diameters are 1.0, 1.8 and 2.7 m. The water depth below the impeller, B = 1/3 H. H is the water depth in flocculator.
- A nuclear reactor is cooled by liquid sodium. The liquid sodium has the following properties: dynamic viscosity = 0.41 mPa·s, specific heat capacity = 1.2 kJ/kgK, thermal conductivity 82 W/mK. Which of the following statements is correct for this scenario? please explain A The thermal boundary layer is thicker than the hydraulic boundary layer. B Heat is transferred through the fluid more easily than momentum. C The velocity varies significantly from the surface to the thickness of the thermal boundary layer. D The hydraulic boundary layer is thicker than the thermal boundary layer.Required information Water at 20°C is flowing with velocity of 0.89 m/s between two parallel flat plates placed 1 cm apart. Given: The properties of water at 20°C are p= 998.0 kg/m3, µ = 1.002 x 103 kg/m-s and Pr = 7.01 Determine/the distance from the entrance at which the velocity boundary layers meet. (Round the final answer to one decimal place.) The distance from the entrance at which the velocity boundary layers meet is m.Nutrient media is flowing at a rate of 1.5 L min in a tube that is 5 mm in diameter. The walls of the tube are covered with antibody-producing cells, and these cells are anchored to the tube wall by their interaction with a special coating material that was applied to the surface of the tube. If one of these cells has a surface area of 500 um², what is the amount of force that each cell must resist as a result of the flow of this fluid in the tube? Assume the viscosity of the nutrient media is 1.2 cP=0.0012 Pa sec.
- Q.1) Determine the convection heat transfer coefficient and the heat flux on the plate surface for flow of air at T = 20° C over a plate surface maintained at a constant temperature of T, = 160° C. if the dimensionless temperature profile within the air layer T(y)-Too = e-ay where a = 3200 m¹ and y is the vertical T₁-Ta over the plate is determined to be distance measured from the plate surface in m.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?The next 8 questions are all related to the following problem statement and figure. Air at 27°C with a free stream velocity of u» = 10 m/s is used to cool electronic devices mounted on a printed circuit board (PCB). Each device dissipates 40 mW (rate of conversion of electrical energy into thermal energy), is thin, and can be modeled as isothermal with a square top that is 5 mm by 5 mm. Due to the low thermal conductivity of the PCB, all of the dissipated energy can be assumed to be transferred out of the devices from their tops. A turbulence promoter (turbulator) is located at the leading edge of the board, causing the boundary layer to be turbulent over the entire length of the PCB. Estimate the surface temperature of the fourth device located 15 mm from the leading edge of the board. Use properties of air at T= 52°C and atmospheric pressure. Air Turbulator Fourth device X = 15 mm Printed circuit board Itt