Heat Transfer Coefficient of Pipe Wall
The resistance to the flow of heat by the material of pipe wall can be expressed as a "heat transfer coefficient of the pipe wall". However, one needs to select if the heat flux is based on the pipe inner or the outer diameter.
where k is the effective thermal conductivity of the wall material and x is the wall thickness.
If the above assumption does not hold, then the wall heat transfer coefficient can be calculated using the following expression:
where di and do are the inner and outer diameters of the pipe, respectively.
The thermal conductivity of the tube material usually depends on temperature; the mean thermal conductivity is often used.
Read more about this topic: Heat Transfer Coefficient
Famous quotes containing the words heat, transfer, pipe and/or wall:
“Nowadays men cannot love seven night but they must have all their desires: that love may not endure by reason; for where they be soon accorded and hasty, heat soon it cooleth. Right so fareth love nowadays, soon hot soon cold: this is no stability. But the old love was not so.”
—Thomas Malory (c. 1430–1471)
“If it had not been for storytelling, the black family would not have survived. It was the responsibility of the Uncle Remus types to transfer philosophies, attitudes, values, and advice, by way of storytelling using creatures in the woods as symbols.”
—Jackie Torrence (b. 1944)
“It is not that the Englishman can’t feel—it is that he is afraid to feel. He has been taught at his public school that feeling is bad form. He must not express great joy or sorrow, or even open his mouth too wide when he talks—his pipe might fall out if he did.”
—E.M. (Edward Morgan)
“The poisoned rat in the wall
Cuts through the wall like a knife,
Then blind, drying, and small
And driven to cold water,
Dies of the water of life....”
—Allen Tate (1899–1979)