Heat transfer: a review of 1999 literature.

https://www.research.manchester.ac.uk/portal/files/45954283/HMT_2016_1595_Revision_3_V0.pdf

Rotating metal foam structures for performance enhancement of double-pipe heat exchangers

As passive enhancement devices, twisted tape insert has been used for almost a century, the most dominant heat transfer enhancement mechanism of circular tube fitted with twisted tape is the secondary flow generated by the tape. There is a parameter to specify the intensity of secondary flow, but this parameter cannot be applied to more general cases. Here cross-averaged absolute vorticity flux in the main flow direction is used to specify the intensity of secondary flow produced by twisted tape inserted in a tube. The relationship between the intensity of secondary flow and the intensity of laminar convective heat transfer is studied using a numerical method. The results reveal that the cross-averaged absolute vorticity flux in the main flow direction can reflect the intensity of secondary flow and a significant relationship between this cross-averaged absolute vorticity flux and Nusselt number exists for studied cases. The presented results validate that the cross-averaged absolute vorticity flux in the main flow direction is a general specifying of the intensity of secondary flow and can be used in other cases.

The relationship between absolute vorticity flux along the main flow and convection heat transfer in a tube inserting a twisted tape

https://www.research.manchester.ac.uk/portal/files/50246679/HMT_D_15_00716R1Developing_Convective_Flow_in_a_Square_Channel_Partially_Filled_with_a_High_Porosity_Metal_Foam_and_Rotating_in_a_Parallel_Mode.pdf

C.Y. Soong

Papers

Development of secondary flow and convective heat transfer in isothermal⧹iso-flux rectangular ducts rotating about a parallel axis