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304 316L Oval Twisted Shell Tube Heat Exchanger With Enhanced Turbulence-73

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Packaging & Delivery

4~6 months

Specifications

304 316L Oval Twisted Shell Tube Heat Exchanger With Enhanced Turbulence

 

Twisted tube heat exchanger

Based on the traditional tube & shell heat exchanger, the Twisted Tube Heat Exchanger replaces the plain straight tubes with oval twisted tubes as the heat transfer components. The cross section along the length direction forms an oval spiral channel so that complicated flow featured by rotation of the fluid is caused to produce strong rotating turbulence. Tubes at shell side of the heat exchanger are supported by contacts at long axis of neighboring tubes (as fig.1-1), which eliminates the necessity of baffle plate and enables compact arrangement of tubes in the shell. In this way, it reduces the size and weight of heat exchanger and overcome the vibration of heat transfer tubes. 

Fig. 1-1 Cross section of twisted tube

Fig. 1-2 Core of twisted tube heat exchanger

 

II Work Principle / flow

The spiral channel causes longitudinal rotation and secondary swirl of fluid when the fluid flows through, and such swirl intensifies the turbulence, reduces the boundary layer of heat transfer and improves the mixing of fluid. Accordingly, the improved mixing maintains higher temperature gradient near the tube wall and results in higher Nu value and thus greatly increases coefficient of heat transfer.

Fig. 2-1 Flow mechanism in tube

Owing to the centrifugal force, the fluid at shell side changes the velocity & direction periodically so as to enhance the longitudinal mixing. In addition, the shell-side fluid flowing through the contact point at the spiral line of neighboring tube produces wake flow detaching from the tube, which enhances the turbulence, destructs the fluid boundary layer on the tube wall and improves the heat transfer at shell side.

Fig. 2-2 Flow mechanism in shell side

 

III Specification

Model

QYT16, QYT20, QYT25, QYT32

Material

304, 316L, SMO, Ti
Manufacture code / standard NB/T47007. GB150
Design code

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Shanghai Marine Diesel Engine Research Institute

  • China (Mainland)China (Mainland)
  • Manufacturers
  • Ms.Mrs. Tan Ling
  • 86-21-51151156
  • 86-21-51711742
  • intl@csic711.com
  • No. 3111, Huaning Road, Shanghai, 201108, P. R. China

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