Engineering, 19.02.2020 04:56 brillamontijo

A rod of diameter D = 25 mm and thermal conductivity k = 60 W m-1 K-1 protrudes normally from a furnace wall that is at TH. = 220degree C and is covered by insulation of thickness Lins = 200 mm. The rod is welded to the furnace wall and is used as a hanger for supporting instrumentation cables. To avoid damaging the cables, the temperature must be maintained below a specified operating limit of Tmax = 100 degree C. The ambient air temperature is Tinfinity = 23degree C, and the convection coefficient is h = 17 W m-2 K-1. Derive an expression for the exposed surface temperature as a function of axial location on the rod if it is 700 mm long and the tip adiabatic, total and plot the temperature as a function of length. Repeat your calculations for an insulation layer only 100 mm thick.

Answers: 3

Show answers

Another question on Engineering

Engineering, 03.07.2019 14:10

When at a point two solid phase changes to one solid phase on cooling then it is known as a) eutectoid point b) eutectic point c) peritectic point d) peritectoid point

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)

Answers: 3

Answer

Engineering, 04.07.2019 18:10

The flow rate of air through a through a pipe is 0.02 m5/s. a pitot static tube is placed in the flow. the radius of the pitot static tube is 1 mm. assuming the flow to be steady and the air to be at 300k, calculate the difference in total and static pressure if the diameter of the pipe is: (a) d 0.1 m d 0.05 m (c) d 0.01 m

Answers: 2

Answer

You know the right answer?

A rod of diameter D = 25 mm and thermal conductivity k = 60 W m-1 K-1 protrudes normally from a furn...

Questions