EFFECT OF CORE-ROD DIAMETER ON WIRE COIL INSERTS FOR HEAT TRANSFER AND FRICTION FACTOR OF HIGH-PRANDTL NUMBER MAGNETIC Fe3O4 NANOFLUIDS INA FULLY DEVELOPED LAMINAR FLOW

2021 ◽  
Vol 52 (3) ◽  
pp. 49-75
Author(s):  
Lingala Syam Sundar ◽  
Tesfahun Tegegne Akanaw ◽  
Yihun Tefera Sintie ◽  
Z. Said ◽  
Kotturu V. V. Chandra Mouli ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Prandtl Number ◽  
Friction Factor ◽  
Wire Coil ◽  
High Prandtl Number ◽  
Core Rod ◽  
Magnetic Fe3o4

scholarly journals Periodically fully developed laminar flow and heat transfer in a two-dimensional horizontal channel with staggered fins

2017 ◽  
Vol 21 (6 Part A) ◽  
pp. 2443-2455 ◽  
Author(s):  
Oğuz Turgut ◽  
Kamil Arslan
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Laminar Flow ◽  
Prandtl Number ◽  
Friction Factor ◽  
Horizontal Channel ◽  
Flux Boundary Condition ◽  
Working Fluids ◽  
Flow And Heat Transfer ◽  
Smooth Channel

The 2-D periodically fully developed laminar forced convection fluid flow and heat transfer characteristics in a horizontal channel with staggered fins are investigated numerically under constant wall heat flux boundary condition. Study is performed using ANSYS Fluent 6.3.26 which uses finite volume method. Air (Pr @ 0.7) and Freon-12 (Pr @ 3.5) are used as working fluids. Effects of Reynolds number, Prandtl number, fin height, and distances between two fins on heat transfer and friction factor are examined. Results are given in the form of non-dimensional average Nusselt number and average Darcy friction factor as a function of Reynolds number for different fin distances and Prandtl numbers. The velocity and temperature profiles are also obtained. It is seen that as the fin distance increases, behavior approaches the finless channel, as expected. Also, thermal enhancement factors are given graphically for working fluids. It is seen that heat transfer dominates the friction as both the distance between two fins and Prandtl number increase. It is also seen that fins having blockage ratio of 0.10 in 2-D periodically fully developed laminar flow is not advantageous in comparison to smooth channel without fins.

Augmentation of Heat Transfer of High Prandtl Number Fe3O4/vacuum pump oil nanofluids flow in a tube with twisted tape inserts in laminar flow

2020 ◽  
Vol 56 (11) ◽  
pp. 3111-3125
Author(s):  
L. Syam Sundar ◽  
Manoj K. Singh ◽  
António M.B. Pereira ◽  
António C.M. Sousa
Keyword(s):  
Heat Transfer ◽  
Laminar Flow ◽  
Prandtl Number ◽  
Vacuum Pump ◽  
Twisted Tape ◽  
High Prandtl Number

Numerical Analysis of Laminar Forced Convection in Sinusoidal-Wavy-, Rounded-Ellipse-, and Rounded-Vee-Shaped Corrugated-Plate Channels

2010 ◽  
Author(s):  
Dean Ferley ◽  
Scott J. Ormiston
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Numerical Analysis ◽  
Prandtl Number ◽  
Friction Factor ◽  
Forced Convection ◽  
Reynolds Numbers ◽  
Ansys Cfx ◽  
Prandtl Numbers ◽  
Laminar Forced Convection

Numerical analysis of steady, two-dimensional, laminar forced convection in corrugated-plate channels is performed using a commercial CFD code: ANSYS CFX. The flow domain consists of six modules in each of three wall corrugations: sinusoidal-wavy-shaped (SWS), rounded-ellipse-shaped (RES), and rounded-vee-shaped (RVS). One ratio of minimum-to-maximum plate spacings and one module length-to-height ratio is considered. Fluid flow and heat transfer are repeating in the modules and the results are examined in a typical module in the fully-developed region for Reynolds numbers in the range of 25 to 300 for Prandtl numbers of 0.7 (air), 2.29 (water), and 34.6 (ethylene glycol). The RES corrugation produced the highest peak value of local Nusselt number as well as the highest friction factor. The SWS corrugation produced the highest average Nusselt number, except at a Prandtl number of 34.6 at higher Reynolds number where the RES corrugation had the highest value. The RVS corrugation had the lowest friction factor for the geometric configuration considered. The highest heat transfer rate per unit pumping power was found at the highest Prandtl number for the RES corrugation.

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