An L1-m-long vertical copper tube of inner diameter Di nm contains liquid water at Tw=0°C. On a winter day, air at V cross flow over the tube. = Determine the heat loss per unit mass from the water when the tube
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- * Your answer is incorrect. An L = 1-m-long vertical copper tube of inner diameter D; = 20 mm and wall thickness t = 2 mm contains liquid water at Tw 0°C. On a winter day, air at V = 3 m/s, T = -20°C is in cross flow over the tube. = Determine the heat loss per unit mass from the water when the tube is full of water, in W/kg. Evaluate the properties of copper at 300 K. 9M = i 207.32 W/kg Physical Properties Mathematical FunctionsRefrigerant-134a is being transported at 0.08 kg/s through a Teflon tube of inside diameter D; = 20 mm and outside diameter Do = 25 mm, while atmospheric air at V = 28 m/s and 300 K is in cross flow over the tube. What is the heat transfer per unit length of tube, in W/m, to Refrigerant-134a at 230 K? q' = i W/m Use Hilpert correlation to estimate the external heat transfer coefficient, and please state ALL assumptions.Q2/ cylindrical electrical heating element (dissipated 1000 W/m) of diameter D=10 mm, thermal conductivity k=240 W/m K, density 2700 kg/m3, and specific heat cp = 900 J/kg K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 10 m/s, respectively. calculate the surface temperature per unit length of the heater.
- Heat transfer Air flows through a smooth thin-walled rectangular duct of height, a= 0.3 m and width, b=1 m. The air is heated by the duct walls at a uniform heat flux of 250 W/m2 . At some location inside the duct, the mean velocity and temperature of air was measured to be um = 0.05 m/s and Tm = 350 K, respectively. (a) What is the hydraulic diameter of the duct? (b) What is the Reynolds number for the flow in the duct? (c) Is the flow laminar or turbulent? (d) Assuming fully developed flow, what is the heat transfer coefficient (h) at this location?Consider a thick-walled steel pipe of inside and outside diameters D-20mm_and d =40mm and 10m length. The outer surface of the pipe is maintained at T_{s} = 90 C water entered at the rate of m =1kg/s and T mi =20 C.What is the outlet temperature of the water? What is the inner surface temperature of the pipe at the outlet? Neglect the natural convection. Steel: rho = 7830kg / (m ^ 3) k = 49W / m * K c_{p} = 550J / k * gKConsider two cases involving parallel flow of dry air at V = 4.5 m/s, T, = 45°C, and atmospheric pressure over an isothermal plate at T = 20°C. In the first case, Re= 5x 105, while in the second case the flow is tripped to a turbulent state atx = 0 m. At whatx -location, in m, are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes, in W/m?, at this location for the two cases? x = i m Jam i W/m? i W/m? I turb
- -1/5 A// For laminar flow over a flat plate, the local heat transfer coefficient h, is known to vary as x¹/5, where x is the distance from the leading edge (x =0) of the plate. What is the ratio of the average coefficient between the leading edge and some location x on the plate to the local coefficient at x? for velocity equation u= 2-0.43x+x² Plot the local heat transfer coefficient over a 0.8 cm length(take T-35c) B// Air at 1 atm and 15°C flows through a long rectangular duct 7.5 cm by 15 cm. A 1.8-m section of the duct is maintained at 120°C, and the average air temperature at exit from this section is 65°C. Calculate the airflow rate and the total heat transferAir at 2 bar and 40°C is heated as it flows through tube of diameter 30mm at a velocity of 10 m/s. Calculate the heat transfer per unit length of the tube when wall temperature is maintained at 100°C all along length of the tube. How much would be the bulk temperature increase over one metre length of the tube ? Use the following relation : Nu = 0.023 Re08 Pr04 u = 20.6 x 106 N- s/m?: Pr = 0.694 c, 1.009 kJ/kg°C; k = 0.0297 kg/m°C;Hot water (cp=4.18 kJ/kg.K, m = 2.8 kg/min) flows inside a tube (inner diameter = 9 mm, Length = 93 cm, thickness = 1.0 mm, k outer surface is 204 kW/m .What is the temperature drop of water ( C)? 40 W/m.K), if the heat flux on the tube %3D tube
- For laminar flow over a flat plate, the local heat transfer coefficient hx = x-1/2 where x is the distance from the leading edge (x=0) of the plate. What is the average heat transfer coefficient hx from the leading edge to location x.Q2/ A tube bank 10 rows high and 7 rows deep with Sp-Sn= 60 mm. Uses in-line arrangement of 30 mm diameter tubes and tube length of 1m. Air with upstream conditions of Too =27 °C and v= 15 m/s in cross flow over the tubes, while a tube wall temperature of 100 °C is maintained by steam condensation inside the tubes. Determine the temperature of air leaving the tube bank.Water flows in a 3.5-cm-diameter pipe so that the Reynolds number based on diameter is 2000 (laminar flow is assumed). The average bulk temperature is 10°C. What would the heat transfer coefficient be in W/m2.°C for such a system if the tube wall was subjected to a constant heat flux and the velocity and temperature profiles were completely developed? Evaluate properties at bulk temperature.