When liquids flow through pipes, heat transfer and pressure loss depend largely on the flow conditions of the fluid.
The Reynolds number is the characteristic value here.
On the basis of experimental approaches, the TWIS module calculates the heat transfer coefficient  and the pressure loss  in laminar flow tubes with twisted-tape inserts.
At the same time, the heat transfer coefficient and the pressure loss are calculated according to the VDI Heat Atlas, Chapter G1  or L1.2 , for tubes with a unobstructed flow cross-section.
By comparing the two versions in the program, the heat transfer coefficients and the pressure loss can be compared.
Especially in the flow of highly viscous media (e.g. thermal oil), the heat transfer coefficient is significantly improved by the use of twisted-tape inserts.
- A.E. Bergles: “Augmentation of heat transfer” HEDH (Heat Exchanger Design Handbook) 1983, Hemisphere f.C.
- S.W. Hong; A.E. Bergles: “Augmentation of laminar flow heat transfer in tubes by means of twisted-tape inserts” Technical Report, Engineering Research Institute, Iowa State University
- “Wärmeübergang bei der Strömung durch Rohre”, VDI-Wärmeatlas
- “Druckverlust bei der Strömung durch Rohre”, VDI-Wärmeatlas
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