Turbulent heat transfer in tubular heat exchangers with twisted tape

2018 ◽  
Vol 135 (3) ◽  
pp. 1863-1869 ◽  
Author(s):  
R. Hosseinnejad ◽  
M. Hosseini ◽  
M. Farhadi
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Turbulent Heat Transfer ◽  
Twisted Tape ◽  
Turbulent Heat

Enhancement of Turbulent Heat Transfer Using Copper Twisted Tape

2018 ◽  
Vol 8 (1) ◽  
pp. 01-05
Author(s):  
Gokulnath G. ◽  
Govindaraj R. ◽  
Eazhil K.M. ◽  
Senthilkumar L.
Keyword(s):  
Heat Transfer ◽  
Turbulent Heat Transfer ◽  
Twisted Tape ◽  
Turbulent Heat

scholarly journals Fluid flow and heat transfer enhancement in wings with combined solid ring twisted tape inserts circular heat exchanger tube

2019 ◽  
Vol 23 (6 Part B) ◽  
pp. 3893-3903
Author(s):  
Ravi Datt ◽  
Mangal Bhist ◽  
Alok Kothiyal ◽  
Rajesh Maithani ◽  
Anil Kumar
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Heat Exchanger ◽  
Hydrodynamic Performance ◽  
Turbulent Heat Transfer ◽  
Twisted Tape ◽  
Turbulent Heat ◽  
Heat Exchanger Tube ◽  
Circular Heat ◽  
Exchanger Tube

Experimental examination is carried out to study the turbulent heat transfer and fluid-flow characteristics in circular heat exchanger tube using combined wing with solid ring twisted tape inserts. A series of experiments has been performed with the range of Reynolds number varied from 3000 to 21000, number of twisted taped inserts, NTT, varied from 1.0 to 4.0 with constant value of other twisted tape parameters such as rings pitch ratio, dR /DT = 1.0, wing pitch ratio, PW /WT = = 3.0, and wing depth ratio, Wd /WT = 1.67. Based on the examined, turbulent heat transfer and fluid-flow in wing with combined solid ring twisted tape inserts results are compared with plain circular tube under same operating conditions. The experimental results show that the heat transfer is increased around 5.66 times than plane circular heat exchanger tube. The thermal and hydrodynamic performance parameter based on equal pumping power, ?p, was found to be highest for NTT = 3.0. The optimum value of thermal and hydrodynamic performance has been found to be 2.74 for Reynolds mumber of 3000 within the range of the parameters investigated. Multiple wings with solid rings twisted tape inserts have been also shown to be thermally as well as hydraulically better in comparison to other similar twisted tape insert geometries.

Numerical Investigation on Air Side Performance of Fin-and-Tube Heat Exchangers With Large Diameter Tubes and Large Number of Tube Rows

2011 ◽  
Author(s):  
Feng Zhou ◽  
David Geb ◽  
Ivan Catton
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Large Diameter ◽  
Turbulent Heat Transfer ◽  
Navier Stokes ◽  
Turbulent Heat ◽  
Tube Heat Exchanger ◽  
Ansys Cfx ◽  
Sst Model ◽  
Volume Method

In the present study, air-side turbulent heat transfer and friction characteristics of fin-and-tube heat exchangers with a large number of tube rows and large diameter of tubes are investigated numerically. Finite Volume Method based CFD software, Ansys CFX, was used as the 3-D Reynolds-averaged Navier-Stokes Solver. A k-ω based Shear-Stress-Transport (SST) model was used to predict the turbulent flow and heat transfer through the fin-and-tube heat exchanger coil. The effects of parameters such as Reynolds number, the number of tube rows, tube diameter, tube pitches and fin pitch are examined. In the end, correlations for the Nusselt number and friction factor which applicable to fin-and-tube heat exchangers with large number of large-diameter tube rows are proposed.

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