Q3/Air at 0.5 atm pressure and 27 C flows across a 34-cm-square plate at a velocity of 20 m/s. The plate temperature is maintained at 127 °C. Calculate the heat lost by the plate.
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- Q1) 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 hydrodynamic boundary layer thickness, thermal boundary layer thickness, local and average values of friction coefficient, heat transfer coefficient and refrigeration necessary to maintain the plate temperature. Also find the values of displacement and momentum thicknesses. Consider a plate of 1 mx 1 m size.Brine enters a cooler at the rate of 50 m /hr at 15°C and leaves at 1°C. Specific heat and specific gravity of brine are 1.07 kJ/kg-K and 1.1 respectively. Calculate the heat removed in kcal per second.air is flowing inside of a pipe with radius=0.4 meters at a mass velocity of 29.4 kg/s*m2 at 322 K, with the walls of the pipe at 300 K. At the conditions of the experiment, the viscosity of air is 1.984 x 10-5 Pa*s, the density of air is 1.22 kg/m3, the heat capacity is 1 kJ/kg*K, and the thermal conductivity is 0.025 W/m*K. Determine the rate of heat loss by air per meter of duct.
- It has a density of 5900 kg/m3 and a specific heat of 590J/kg.°C with a diameter of 15 cm. A stainless steel ball comes out of an oven at 350 °C. Then the ball is at a pressure of 1 atm and It is exposed to air flowing at 30 °C at a speed of 6 m/s. The surface temperature of the ball can reach 250 °C. is falling. Calculate how long this cooling process will take.Q4/ Liquid ammonia at 10°C and I atm flows across a horizontal cylinder at a velocity of 5 m/s. The cylinder has a diameter of 2.5 em and length of 125 cm and is maintained at a temperature of 30°C. Calculate the heat lost by the cylinder.Q4/ Liquid ammonia at 10°C and I atm flows across a horizontal cylinder at a velocity of 5 m/s. The cylinder has a diameter of 2.5 em and length of 125 em and is maintained at a temperature of 30°C. Calculate the heat lost by the cylinder.
- b) A 0.4-W cylindrical electronic component shown in Figure Q3b with diameter 0.3 cm and length 1.8 cm is mounted on a circuit board is cooled by air flowing across it at a velocity of 150 m/min and temperature is 40 °C. Take the pressure of air 1 atm and the film temperature to be 50 °C, determine the surface temperature of the component. Resistor 0.4 W D= 0.3 cm Figure Q3bQ3: Air flows across a 20-cm-square plate with a velocity of 5 my/s. Free-stream conditions are 10:C and 0.2 atm. A heater in the plate surface furishes a constant heat-flux condition at the wall so that the average wall temperature is 100-C. Calculate the surface heat flux and the value of h at an x position of 10 em. Answers: Q= 1414 W, b= 133 Wim.CGlycerin passes through a pipe of 30 mm inside diameter at a mass flow rate of 700 kg / hr. The wall of the 2.5 m heating section of the pipe is kept constant at 115 ° C. The glycerin inlet temperature is given as 15C. What is the exit temperature of glycerin from the pipe?
- Q3: Air flows across a 20-cm-square plate with a velocity of $ m/s. Free-stream conditions are 10-C and 0.2 atm. A heater in the plate surface furnishes a constant heat-flux condition at the wall so that the average wall temperature is 100-C. Calculate the surface heat flux and the value of h at an x position of 10 cm. Answers: Q= 1414 W, b= 13.3 Wm?.CEngine oil at a temperature of 4 oC is pushed over a 20 cm square plate at a speed of 1.2 m / s. The plates are heated to a uniform temperature of 60oC. Count the heat released by the plate!Q3: A square flat plate of 1 m² area whose two surfaces temperature is 90 °C is cooled by air at 20 °C flowing over both sides parallel to the plate at 2 m/sec. Calculate the rate of cooling plate Air at 20°C 1111