文档介绍：Comparison of the Pipe Flow Results Obtained from
ANSYS with The Experimental Results
Avijit Marwaha
Senior Year, Civil Engineering
Indian Institute of Technology Roorkee

Abstract
The head loss due to friction in cooling tubes in the condenser of a steam turbine is the most important
issue while designing the surface condenser of Steam Turbine for Thermal Power Stations. The inside
pressure drop due to this is important as it takes considerable amount of pumping power to circulate large
quantity of cooling water through the cooling tubes of a condenser.
In this paper an attempt has been made pare FLOTRAN results with experimental results obtained
by Moody for friction factors for different roughness. For flow analysis inside the condenser tube, a
circular pipe of inside diameter of meter (same as that being used in a condenser) has been
considered for determination of friction factor at different Reynolds numbers. The pipe length is 10 meters,
which is sufficient for the given range of flow to get fully developed. Reynolds Numbers considered for
laminar flow are from 700 to 2300 and from 4x103 to 1x108 for turbulent flows. Three relative roughness
values considered are (. smooth pipe), for which data is available in Moody’s
graph. Three relative roughness values of , and are also considered pared
with the results given by Nikuradse. The FLOTRAN values for laminar and turbulent flow with relative
roughness are closely matching with the experimental results. Results for pipe with rough surfaces are
also found to be in good agreement with experimental values.
Introduction
In thermal power stations, a condenser is used to condense exhausted steam from the turbine. The steam is
cooled by water. Water flows inside of the cooling tubes and steam flows outside the cooling tubes of the
condenser. The inside pressure drop is important, as it takes considerable am