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Forced cooling of underground electric power transmission lines. Part III. The prediction of friction factors in turbulent flow for an underground forced cooled pipe-type electrical transmission cable system. Yearly report

Technical Report ·
OSTI ID:7295353
; ;
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 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 to 30 percent above the experimentally determined values.
Research Organization:
Massachusetts Inst. of Tech., Cambridge (USA). Energy Lab.
OSTI ID:
7295353
Report Number(s):
PB-239307; MIT-EL-74-005
Country of Publication:
United States
Language:
English

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Related Subjects

200300* -- Electric Power Engineering-- Power Transmission & Distribution-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
CABLES
COMPUTER CODES
CONDUCTOR DEVICES
CONVECTION
COOLING
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
FORCED CONVECTION
FORTRAN
FRICTION
HEAT TRANSFER
OIL-FILLED CABLES
POWER TRANSMISSION
PROGRAMMING LANGUAGES
SIMULATION
TURBULENT FLOW
UNDERGROUND POWER TRANSMISSION