|Place of Origin:||CHINA|
|Model Number:||QYT series|
|Minimum Order Quantity:||1 unit|
|Price:||Customized Product, Quoted Case By Case|
|Packaging Details:||Seaworthy packing|
|Delivery Time:||4~6 months|
|Payment Terms:||L/C, T/T|
|Structure:||Twisted Tube Core Inside A Steel Casing||Material:||304, 316L, SMO, Ti|
|Function:||Improved Efficiency Of Heat Exchange||Advantage:||Low Foulding, No Dead Zone, Hard To Block|
|Warranty:||12 Months Since Operation Or 18 Months Since Delivery|
twisted tube heat exchanger,
multi tube heat exchanger
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
|QYT16, QYT20, QYT25, QYT32|
|304, 316L, SMO, Ti|
|Manufacture code / standard||NB/T47007. GB150|
|Design code / standard||NB/T47007. GB150|
|Design pressure||F.V. – 20Mpa|
|Design temperature||-20 - 900℃|
|Main test point||Fluid inlet / outlet temperature & pressure|
|Service life of critical component||15 years|
|Availability of spare parts||Long term|
|Work / service scope||Design, fabrication and installation supervision|
---Low pressure drop.
---High heat transfer efficiency.
---No dead zone of flow, hard to block up.
---Capable of overcoming induced vibration, improved reliability.
---Advanced calculation software for reliable and reasonable design.
---Rich fabrication experience for safe and reliable product.
---Sufficient stock for quick delivery.
---Efficient management for lower cost.