Engineering, 11.06.2020 18:57, katii54feliz

A liquid (NOT WATER) is passed through a tube with a square cross section of 0.01m x 0.01m at a Reynolds number of 2,000. The liquid has a Prandtl number of 1, a thermal conductivity of 0.2 W/mK, and a heat capacity of 4,000 J/kg*K. Simultaneously, air is blown at a speed of 20 m/s and a temperature of 25°C over the outside of the tube such that the flow is perpendicular to one of the square sides. The liquid enters the tube at 200°C and exits at 50°C. Presume the tube wall is extremely thin. a. For what length of tube can the developing entrance length be ignored and the internal flow approximated as fully developed throughout ?
b. If the tube is 20m long, what is the heat transfer between the two fluids ?
c. If the tube is 20m long, what is the mass flow rate of the liquid through the tube ?
Air: k = 0.03 W/mK, p = 1 kg/m?, v = 2e-5 méls, u = 2e-5 Pas,
a =2.9e-5 m²/s, B= 30-3K-!, Pr = 0.7, Cp = 1,000 J/kgK,

Answers: 1

Show answers

Other questions on the subject: Engineering

Engineering, 04.07.2019 16:10, TheOriginalMeyah

An electrical motor raises a 50kg load at a construct velencity .calculate the power of the motor, if it takes 40sec to raise the load through a height of 24m(take g =9.8n/g)

Answers: 2

continue

Engineering, 04.07.2019 18:10, ahmedeldyame

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Answers: 1

continue

Engineering, 04.07.2019 18:10, yasminothman02

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Answers: 3

continue

Engineering, 04.07.2019 18:10, ijohnh14

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

Answers: 2

continue

Do you know the correct answer?

A liquid (NOT WATER) is passed through a tube with a square cross section of 0.01m x 0.01m at a Reyn...