### Electrical conductivity of the pipe

Assignment Help Mechanical Engineering
##### Reference no: EM13881080

Electrical heating of a pipe (Fig.), in the manufacture of glass-coated steel pipes, it is common practice first to heat the pipe to the melting range of glass and then to contact the hot pipe surface with glass granules. These granules melt and wet the pipe surface to form a tightly adhering nonporous coat. In one method of preheating the pipe, an electric current is passed along the pipe, with the result that the pipe is heated (as in S10.2). For the purpose of this problem make the following assumptions:

(i) The electrical conductivity of the pipe ke is constant over the temperature range of interest. The local rate of electrical heat production Se is then uniform throughout the pipe wall.

(ii) The top and bottom of the pipe are capped in such a way that heat losses through them are negligible.

(iii) Heat loss from the outer surface of the pipe to the surroundings is given by Newton's law of cooling: qr = h(T1 - Ta). Here h is a suitable heat transfer coefficient. How much electrical power is needed to maintain the inner pipe surface at some desired temperature, TK, for known k, Ta, h, and pipedimensions? #### Compressor and the isentropic efficiency of the compressor

A refrigeration unit operating on R-134a is used to maintain a freezer at -15°C. The refrigeration unit operates at a suction pressure of 140kPa and a discharge pressure of 90

#### Describe the purpose of a kick-off meeting for a project

Describe the purpose of a kick-off meeting for a project. What are typical items that are presented and discussed during the meeting, including specific assignments that a p

#### Determine the required cross-sectional area

Members AB and BC of the truss shown are made of the same alloy. It is known that a 20-mm-square bar of the same alloy was tested to failure and that an ultimate load of 120

#### Construct a suitable finite element model

Construct a suitable finite element model and compare the FEA predictions with the theoretical data and produce a graph to show the stress distribution

#### Calculate the thermal efficiency of the cycle

Calculate the thermal efficiency of the cycle if the initial pressure is 10 bar and the maximum pressure is 35 bar. Compare this to the Carnot efficiency achievable between

#### Specimen of this material elongate when a true stress

For some metal alloy, a true stress of 345 MPa (50040 psi) produces a plastic true strain of 0.02. How much will a specimen of this material elongate when a true stress of 417

#### Determine whether or not the block will slide

A 150 lb block rests on a horizontal floor. The coefficient of friction between the block and the floor is 0.30. A pull of 40 lb, acting upward at an angle of 30° to the hor

#### Determine the amount of entropy produced

Assuming the tank is initially evacuated and that the helium behaves as an ideal gas with constant specific heats, determine the amount of entropy produced when the tank is

### Write a Review 