CuO-water nanofluid flow and heat transfer in a heat exchanger tube with twisted tape turbulator

2018 ◽  
Vol 336 ◽  
pp. 131-143 ◽  
Author(s):  
M. Jafaryar ◽  
M. Sheikholeslami ◽  
Zhixiong Li
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Twisted Tape ◽  
Heat Exchanger Tube ◽  
Nanofluid Flow ◽  
Flow And Heat Transfer ◽  
Exchanger Tube

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.

Development of new correlations for heat transfer and friction loss of solid ring with combined square wing twisted tape inserts heat exchanger tube

2018 ◽  
Vol 32 (2) ◽  
pp. 179-200 ◽  
Author(s):  
Ravi Datt ◽  
Mangal Singh Bhist ◽  
Alok Darshan Kotiyal ◽  
Rajesh Maithani ◽  
Anil Kumar
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Friction Loss ◽  
Twisted Tape ◽  
Heat Exchanger Tube ◽  
Exchanger Tube

scholarly journals Influences of Flow Attack Angles and Flow Directions on Heat Transfer Rate, Pressure Loss, and Thermal Performance in Heat Exchanger Tube with V-Wavy Surface

2018 ◽  
Vol 2018 ◽  
pp. 1-22
Author(s):  
Amnart Boonloi ◽  
Withada Jedsadaratanachai
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Thermal Performance ◽  
Test Section ◽  
Vortex Flow ◽  
Wavy Surface ◽  
Heat Exchanger Tube ◽  
Flow And Heat Transfer ◽  
Flow Directions ◽  
Exchanger Tube

Numerical investigations on flow and heat transfer characteristics in the heat exchanger tube with the V-wavy surface are presented. The finite volume method with the SIMPLE algorithm is selected to solve the present problem. The effects of flow attack angles (α = 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, and 60°) and flow directions (V-tip pointing downstream known as “V-Downstream” and V-tip pointing upstream known as “V-Upstream”) for the V-wavy surface on flow and heat transfer patterns are considered for both laminar and turbulent regions. The laminar regime is studied in the range Re = 100–1200, while the turbulent region is investigated in the range Re = 3000–10,000. The mechanisms on flow and heat transfer in the test section are reported. The numerical results reveal that the V-wavy surface changes the flow structure in the test section. The vortex flow is produced by the V-wavy surface. The vortex flow disturbs the thermal boundary layer on the heat transfer surface that is the reason for heat transfer and thermal performance enhancements. The optimum flow attack angles of the V-wavy surface for laminar and turbulent regimes are concluded.

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