Air at atmospheric pressure and 27 degree celsius is blown across a long 4.0-cm diameter tube at a velocity of 20 m/s. Determine the heat transfer rate per unit length. Assume that wall temperature is 60 degree celsius

A transformer is to be cooled via forced air convection. To increase the effectiveness of thecooling, Alloy 1095 cast aluminum fins are attached to the top of the transformer overwhich air is blown (negligible thermal contact resistance between the transformer and thefins). The fins are 2 cm thick and 7 cm long and span the entire length of the transformer,and the transformer is 7 cm wide and 10 cm long. Air leaves the cooling fan at 25°C .a) Decide how to model the fins before performing any real analysis. Youare willing to accept some error in your analysis and so you will either model thefins as having adiabatic tips or being infinitely long. You expect the average convectioncoefficient over the heat transfer surfaces for this system to be around 50 W m2– K⁄ .Which tip condition should you use for the fins in your analysis? b) Modeling the transformer as being isothermal, determine the average convectioncoefficient over the heat transfer surfaces. Account for heat transfer from the…

Air at 300 degrees Celsius flows over a plate of dimension 0.5 m by 0.25 m. If the convection heat transfer coefficient is 250 Watts per Sq.m Kelvin, determine the heat transfer rate from the air to one side of the plate if the plate is to be maintained at 40 degrees Celsius.

Determine the convection heat transfer coefficient (in W/m2∙K) for the flow of water at a velocity of 5 m/s in an 8-cm-diameter and 10-m-long tube when the tube is subjected to uniform heat flux from all surfaces. The tube is maintained at a constant temperature of 95°C. Take the properties of water at 25°C. For water at 25°C: ρ = 997 kg/m3; cp = 4180 J/kg∙K; k = 0.607 W/m∙K; ? = 0.891×10-3 kg/m∙s

***answer is correct

Engine oil flows through a 25-mm-diameter tube at a rate of 0.5 kg/s. The oil enters the tube at a temperature of 25°C, while the tube surface temperature is maintained at 100°C. (a) Determine the oil outlet temperature for a 5-m and for a 100-m long tube. For each case, compare the log mean temperature difference to the arithmetic mean temperature difference.

Consider laminar flow of air across a hot circular cylinder. At what point on the cylinder will the heat transfer be highest? What would your answer be if the flow were turbulent?

Q) Water at 12°C flows in a 2.5-cm-diameter pipe and 10-m-long at an average velocity of 0.1 m/s. The surface temperature of the pipe is maintained at 0°C. Disregarding the heat losses with the surrounding, determine; (a) The outlet water temperature, (b) The rate of heat transfer from the water, and (c) The pumping power required to overcome the pressure losses and to maintain the water flowing in the pipe. Take the film (bulk) water temperature to be the inlet water temperature.

Kindly answer Q8 it is linked to Q7

answer=correct