The prediction of friction factors in turbulent flow for an under ground forced cooled pipe-type electrical transmission cable system
Name
MIT-EL-74-005-01437077.pdf
Size
3.24 MB
Format
Adobe PDF
Checksum (MD5)
726db8d5de7ac80bd862bab23a01d6cf
Author(s)
Beckenbach, Joseph William
Glicksman, Leon R.
Rohsenow, Warren Max
Date Issued
1974
Publisher
MIT Energy Lab
Series/Report no.
MIT-EL
74-005
Abstract
Forced cooled systems for underground, oil filled, pipe-type electrical
transmission cable systems are becoming increasingly common in large urban
centers. In systems of this type there exist a number of electrical transmission cables in an oil filled conduit. These cables are wrapped with a
semi-circular, protective skid wire, which increases the turbulence in the flow
and up until now has prevented any accurate or realistic prediction of the
pressure drop. An equation has been used which correlates the friction factor
of the rough surface which has been developed which combines the effects of
the rough and smooth surface on the flow to obtain a friction factor vs. Reynolds
Number plot for the entire pipe-type cable system. This theory has been written
in the form of a FORTRAN IV computer program which accepts as input the geometrical
dimensions of a system and yields as output the friction factor and corresponding
Reynolds Number for the entire pipe-type cable geometry. The results predicted
from the theory are consistently 15-30% above the experimentally determined
values.
Description
Forced cooling of underground electric power transmission lines, pt. 3
Subjects
Underground electric lines -- Cooling
Electric cables
Heat -- Transmission
Friction
Persistent DSpace Link
