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For flow of a liquid metal through a circular tube, the velocity and temperature profiles at a particular axial location may be approximated as being uniform and parabolic, respectively. That is, u(r) C1 and T(r) - Ts C2[1 - (r/ro)2], where C1 and C2 are constants. What is the value of the Nusselt number NuD at this location?
air enters a 0.8 cm i.d tube at 20 degree c with an average velocity of 0.8 ms. the tube wall is kept at 40 degree c.
a 4 l volume of pressure cooker in a kitchen operates at 200 kpa with an exit area of 10 mm2. with well controlled heat
a counterflowing heat exchanger cools air at 600 k 400 kpa to 320 k using a supply of water at 20degc 200 kpa. the
Liquid water at 200 kPa and 20 C is heated in a chamber by mixing it with superheated steam at 200 kPa and 150 C. Liquid water enters the mixing chamber at a rate of 1.3 kg/s, and the chamber is estimated to lose heat to the surrounding air at 25 C a..
a steel rod with a diameter of 2 cm length l25cm thermal conductivity of 50 wmk is exposed to ambient air at 20c. heat
An ideal gas (MW = 26.0 lbm/lb·mol) undergoes a poly tropic process (with poly tropic index being 1.67) from an initial state of 6.9836 ft3/lbm and 60°F to a final volume of 0.86848 ft3/lbm. Show the process on a P-v diagram. Find the specific work o..
For the condition when the floor and duct temperatures are 30 and 80°C, respectively, and the thermal conductivity of concrete is 1.4 W/m · K, calculate the heat rate from each duct, per unit length of duct. Use a grid spacing with ?x = 2?y, where..
the critical shear stress for a crystal material is 3250 psi. if the angle of slip direction is 430 and the normal to
A small steel ball bearing with a mass of 13 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.35 m. Calculate the speed at which the ball leaves the spring.
10 kg of refrigerant r-134a initially at 5 bar and 160 oc undergoes an isothermal internally reversible compression
A new cast iron pipe is 5 km long and 15 mm diameter is used to convey water at a rate of 0.0150m3s-1. Given the absolute roughness of the pipe is 0.26 mm, density of water is 998 kg/m3 and dynamic viscosity of water is 1.14 × 10-3 kgm 1s-1.
a 3 m x 3 m x 2.4 m room losses heat through the walls at a rate of 520 w. determine the final temperature of the room
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