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- 1) Atmospheric air at 25oC and with a speed of 50 m/s is pumped by a fan over a flat plate. a)What is the minimum plate length in order to achieve a Reynolds number of 108 ? b)At what distance from the leading edge would transition occur if critical Re #= 5x105 ? 2) Local Nusselt number is given as Nux=0.04Rex0.9 Pr 1/3. Obtain an expression for, a) average heat transfer coefficient, x b) local heat transfer coefficient, hx c) What is the ratio of the average to local coefficient, x / hx 3) Air is in parallel flow over a flat heater surface which is to be maintained at 140oC. Airflow induces a drag force of 0.25 N on the heater. What is the electrical power needed to maintain the prescribed surface temperature? 4) Air at 1 atm with a velocity of 4 m/s and a temperature of 50oC flows over a flat plate that is at a uniform temperature of 100oC. The plate has a length of 0.20 m and a width of 0.1 m. a) What is the average heat…You are designing a bioreactor that requires turbulent water flow (Re=2300) for better mixing of materials. Your tube diameter is 1.5 inches. What is the minimum volumetric flow rate needed (in in3/s)? **Answer: 7.14 in^3/sQ-2 ) ) A boiler house has natural draught chimney of 20 m height. Flue gases are at temperature of 380°C and ambient temperature is 27°C. Determine the draught in mm of water column for maximum discharge through chimney and also the air supplied per kg of fuel. Ans. [11.77 mm of water, 11.32 kg/kg of fuel
- The friction loss in laminar flow can be calculated using ____________ A. P.K Swammee and A.K. Jain Equation B. Darcy's equation C. Hazen-Williams Equation D. Hagen-Poiseuille equationDuring a retrofitting project of a fluid flow system to reduce the pumping power, it is proposed to install vanes into the miter elbows or to replace the sharp turns in 90° miter elbows by smooth curved bends. Which approach will result in a greater reduction in pumping power requirements?[CE Hydraulics] 5. For the case of turbulent flow in rough pipes, does the friction factor depend on the Reynolds number? Why?
- Two vessels in which the difference of surface levels is maintained constant at 2.4 m are connected by a 75 mm diameter pipeline 15 m long. If the frictional coefficient f may be taken as 0.008, determine the volume rate of flow.?A piping system involves sharp turns, and thus large minor head losses. One way of reducing the head loss is to replace the sharp turns by circular elbows. What is another way?Pressure Drop of Power-Law Fluid in Laminar FlowA power-law fluid having a density of 1041 kg/m3 is flowing through 14.9 m of a tubing with an inside diameter of 0.0524 m at an average velocity of 0.0728 m/s. The rheological or flow properties of the fluid are K′ = 15.23N·sn′/m2 (0.318 lbf·sn′/ft2) and n′ = 0.40. Calculate the pressure drop and friction loss using Eq. (9.1-10) for laminar flow. Check the generalized Reynolds number to make sure that the flow is laminar. Repeat part (a) but use the friction-factor method
- 9. In a completely turbulent flow, the head lossa. Increases with velocityb. Increases with velocity squaredc. Decreases with wall roughnessd. Increases with diameterWater at 15°C is to be heated to 65°C by passing it over a bank of resistance heating rods 4 m long and 1 cm in diameter which are maintained at 90°C. The water is approached by the heater rod bank at the normal direction at an average speed of 0.8 m/s. The rods are arranged in line with longitudinal and transverse steps of SL = 4 cm and ST = 3 cm.Determine the number of rows of NL tubes in the direction of flow needed to achieve the indicated temperature rise. I need the solution from fundamental concepts of how the heat flow behaves in the systemCan you use the friction factor for turbulent flow in a smooth circular tube to predict the fiction factor in an internally finned tube by using the hydraulic diameter?