Q 2- The Nusselt number for flow in a tube is given by Nu = C₁ Rea Prb where the constants, C1, a, and b are 0.023, 0.8, and 0.3, respectively. Estimate a mass-transfer coefficient for moist air flowing in a 30 cm tube with a diameter of 10 cm at the rate of 0.3 m3/s. Assume standard air, Prandtl number is 0.7 and unity Lewis number.

Water (p = 1003.8 kg/m³) flows at the rate of 3.95 L/s in a pipe of diameter 31 mm, which enlarges to 44 mm diameter. Calculate the water mass flow rate in kg/s. Answer: 27

The Reynolds number can be viewed as the ratio of (a) Drag force/Dynamic force (b) Buoyancy force/Viscous force (c) Wall friction force/Viscous force (d) Inertial force/Gravitational force (e) Inertial force/Viscous force

An 80m deep and 100m wide river flows from the left to the right off the page. An action will release two sources of oil to the river: (1) the indirect runoff of oil accumulated on a bridge that runs off site and crosses over the river and (2) the direct and permitted discharge of water containing oil from the activities onsite (a water pollution control plant) to the river. The oil has a molecular weight of 100 g/mol, it fully dissolves in the river water, and it decays in the river with a rate constant of 0.2 d-1. Estimate the potential impact of this action on the concentration of oil in the river at a location 500m downstream of the WPCP. (1) bridge runoff Q1 = 1 m's C = 1 mol/m (2) WPCP discharge Q2 = 50 m's C2 = 0.01 mol/m Qin = 1000 m³'s Cin = 0.001 mol/m? --500m- 500m- -500m 80m 100m a. Recommend the x, y, and z dimensions of the CV. Justify your recommendations. b. Estimate the oil concentration in the water 500m downstream of the WPCP assuming steady and 1D mixed. c. Sketch…

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Please help. I am not sure how to approach this problem. This problem involves heat transfer and internal flow within a pipe. Thank you.

In an absorption tower, ammonia is absorbed from air at atmospheric pressure by aceticacid. The flowrate of 2 kg/m2s in a test corresponds to a Reynolds number of 5100 andhence a friction factor R/ρu2 of 0.020. At the temperature of absorption the viscosity ofthe gas stream is 0.018 mNs/m2, the density is 1.154 kg/m3 and the diffusion coefficientof ammonia in air is 1.96 × 10−5 m2/s. Determine the mass transfer coefficient throughthe gas film in kg/m2s (kN/m2) Explain briefly .

A piston confined in a tube is suddenly accelerated to a velocity at (m/s) which causes a 구2 shock wave if the temperature of the air is 2C). Solution:

From an open water surface with air temperature 22°C, relative humidity is 40% and wind speed is 3 m/s, all measured at height 2 m above the water surface. Assume a roughness height of 0.03 cm. The net radiation is 200 W/m^2. Cp = 1005 J/kg-K A. Calculate the latent heat of vaporization (J/kg) B. Calculate the evaporation using Energy Balance Method (mm/day) C. Calculate the saturation deficit of the vapor pressure (Pa) D. Calculate the evaporation using Priestley-Taylor Method (mm/day)

Please don't give image based answer..thanku Question:- Water vapor enters a continuous flow adiabatic turbine at 9 MPa pressure, 450 o C temperature and 188 m/s velocity, and exits at 50 m/s speed at 20 kPa pressure and 92% dryness. Calculate the turbine inlet cross-sectional area since the mass flow rate of the steam is 12kg/s.