Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cm-ID tube whose surface is maintained at 620 K. What length of tube is required?
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Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cm-ID tube whose surface is maintained at 620 K. What length of tube is required?
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- Water at 900 C and a rate of 0.5 kg/s is cooled to 45° C in a copper pipe of 2 cm outer diameter and 2 mm thickness by a vapor that is condensing on its outer surface at 30° C: a. Determine the pipe length. b. Determine the pressure drop.Water with a mass flow rate of 0.002 kg/s at 18oC flows inside a tube while the flow is already developed hydrodynamically. The inner diameter of the tube is 1.5 cm, and the inner pipe wall temperature is maintained uniformly at 125oC. Calculate the required tube length to increase the water temperature to 82oC.Saturated refrigerant-134a vapor at 34°C is to be condensed as it flows in a 1-cm-diameter tube at a rate of 0.1 kg/min. Determine the rate of heat transfer from the refrigerant. What would your answer be if the condensed refrigerant is cooled to 20°C?
- Geothermal steam at 165°C condenses in the shell side of a heat exchanger over the tubes through which water flows. Water enters the 4-cm-diameter, 14-m-long tubes at 20°C at a rate of 0.8 kg/s. Determine the exit temperature of water and the rate of condensation of geothermal steam.It takes 0.035 W to diffuse water through a temperature 290 K. The tube is 10 m in length and has a 1.5 cm ID. Assume that the total pressure is 0.1 MPa and all condensate remains inside the pipe. Neglect the effects of conduction and radiation. Calculate the rate of evaporation. m/s flowing dry air at 300 K along a cylindrical tube ofAir at 1 atm and 20 C flows in a 2.5-cm-diameter tube. The maximum velocity (m/s) of air to keep the flow laminar is
- 1. Water flows at the rate of 0.5 kg/s in a 2.5-cm-diameter tube having a length of 3 m. A constant heat flux is imposed at the tube wall so that the tube wall temperature is 40◦C higher than the water temperature. Calculate the heat transfer and estimate the temperature rise in the water. The water is pressurized so that boiling cannot occur.Liquid L D Liquid ammonia at -20°C (rho=665.1 kg/m³ and μ = 2.361*10-4 kg/m*s) is flowing through a 35 m long section of a 5 mm diameter copper tube at a rate of 0.1 kg/s then the Reynold's number isAir at atmospheric pressure flowing through a tube of 10 cm diameter at a rate of 0.1 kg/s is to be cooled from 400K to 300K with uniform wall temperature of 250K. Determine the length of the tube. Justify any assumptions that you have made.
- Water is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.48 m and is kept at 108 deg C. What is the power required to boil the water? Tsat 100°C; Properties of water at 100°C: Density, pl= 961 kg/m3; Kinematic viscosity, v = 0.293x10-6 m2/s: Prandti Number. Pr 1.740; Specific heat, Cpl = 4216 J/kg.K; Dynamic viscosity, u = p x v = 961 x 0.293 x 10-6 = 281.57 x10-6 Ns/m2; hfg 2256.9 kJ/kg; pv = 0.597 kg/m3; a = 0.0588 N/m; Csf=0.013; n=1: %3D Select one: O a. 11633.5098 O b. 13259.1393 O c. 16641.2421 O d. 9493.7946Saturated steam at 1 atm is condensed on the external surface of a copper tube with an outside diameter 16 mm and tube wall of thickness 0.5 mm. The tube is cooled internally by water with a mass flow rate of 0.06 kg/s, which in turn is raised in temperature from 15 °C to 60 °C as it flows through the tube. Take the heat-transfer coefficient at the condensing side as 10.0 kW/m² K and the isobaric specific heat-capacity of water as 4180 J/kg K. i) Calculate the heat transfer rate to the cooling water. ii) iii) Calculate the length of the tube. Comment on how to enhance heat transfer in this case.Water is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.51 m and is kept at 111 deg C. What is the power required to boil the water? Tsat = 100°C; Properties of water at 100°C: Density, ρl= 961 kg/m3; Kinematic viscosity, ν = 0.293x10-6 m2/s; Prandtl Number, Pr = 1.740; Specific heat, Cpl = 4216 J/kg.K; Dynamic viscosity, μ = ρ × ν = 961 × 0.293 × 10-6 = 281.57 x10-6 Ns/m2; hfg = 2256.9 kJ/kg; ρv = 0.597 kg/m3; σ = 0.0588 N/m; Csf=0.013; n=1; Select one: a. 25964.0356 b. 52997.1101 c. 49373.4011 d. 38911.7986