Numerical Analysis of Turbulent Fluid Flow and Heat Transfer in a Rectangular Elbow

Debnath, Rabin; Mandal, Arindam; Majumder, Snehamoy; Bhattacharjee, Swarupananda; Roy, Dibyendu

doi:10.18869/acadpub.jafm.67.221.21363

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…Wu, Liu, Luo, Chen and Dai [3] studied the flow field characteristics of the 90 0 rectangular elbow in pushpull ventilation device. Debnath, Bhattacharjee, Roy and Majumder [4] analysed experimentally the turbulent air flow in a two-dimensional rectangular elbow at high Reynolds numbers. They investigated the velocity profiles, flow separation, re-circulation and friction drag etc.…”

Section: Introductionmentioning

confidence: 99%

“…Near the duct outlet, the velocity peak weakens and the profiles become smoother indicating a likely to WSEAS TRANSACTIONS on HEAT and MASS TRANSFER DOI: 10.37394/232012.2020.15.turbulent flow at the exit of the elbow.From the plots it is clear that the k-ε model prediction is not very encouraging. Probably this attribution is due to the fact that a k-ε model provides very poor results in recirculating flow and it requires quite modifications particularly to take care of the stream line curvatures as discussed detail in[52].…”

mentioning

confidence: 99%

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Effects of Cross Jet on Turbulent Main Stream Flow in A Non-Circular Elbow – A Numerical Approach

Debnath¹,

Bhattacharjee

Mandal³

et al. 2020

1790-5044

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The performance of fluid transportation model through non-circular elbow ducts with wall mass injection in predicting the velocity and pressure fields is important in Industrial applications. The present work pertains to the two-dimensional numerical analysis of the developing turbulent fluid flow with uniform mass injection through the top wall of a rectangular elbow. A numerical experimentation using control volume formulation considering standard k   turbulence model has been conducted to study different parameters like the velocity distributions, size and shape of the recirculation bubble as well as the friction factor etc. The size and strength of the recirculation bubbles generated in the bend regions are affected by the continuous entry of mass injected through the wall of the elbow. The results show that the velocity field, reattachment points, friction factor etc. are influenced by the side mass injection. The recirculation bubble has been observed to diminish in size by the injection of mass with corresponding changes in the velocity and the friction factors.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Effects of Cross Jet on Turbulent Main Stream Flow in A Non-Circular Elbow – A Numerical Approach

Debnath¹,

Bhattacharjee

Mandal³

et al. 2020

1790-5044

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show abstract

“…Velocity distribution and flow parameters such as turbulence and boundary shear stress in steady flow conditions were studied widely both experimentally in laboratory and in the field (Nezu and Rodi 1986, Cardoso et al 1989, Kırkgöz 1989, Kırkgöz and Ardıçlıoğlu 1997, Kabiri-Samani et al 2013, Genç et al (2015) and numerically (Song et al 2012, Debnath et al 2015, Shah et al 2015. However, in nature, unsteady flows are the most common type of open channel flows and attracted a great amount of interest for research in the field of hydraulics (Bose and Dey 2012) particularly in the furrow irrigation and in irrigation management systems (Walker and Humpherys 1983, Meselhe and Holly 1993, Kumar et al 2002, Zhang et al 2012.…”

Section: Introductionmentioning

confidence: 99%

The Hysteresis and Shear Velocity in Unsteady Flows

Bombar

2016

JAFM

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The shear velocity is an important parameter in characterizing the shear at the boundary in open channels and there exist methods to estimate the shear velocity in steady flows, but the application and comparison of these methods to non-uniform unsteady flows is limited. In this study, three artificial triangular-shaped hydrographs were generated where the base flow is non-uniform with fine sand bed and the shear velocity was obtained by the methods, u*SV by using the Saint-Venant equations, u*L by using the procedure given by Clauser Method, u*P by using the parabolic law, u*UN by using the momentum equation assuming the slope of energy grade line is equal to bed slope and u*avg by using the average velocity equation are used in this study. The stream-wise components of velocity time series and the velocity profiles were obtained by means of an acoustic Doppler velocity meter. The variation of the shear velocity and the constant for the parabolic law with time is discussed. It is concluded that the shear velocities found by the parabolic law and the average velocity equation can be used interchangeably. Furthermore a hysteresis intensity parameter is proposed in order to examine the depth variation of hysteretic behavior of depth variation both with point velocity and average velocity. It is revealed that the more the unsteady the hydrograph the more the hysteresis both in terms of point velocity and cross-sectional mean velocity.

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A Review on Non-Darcy Flow — Forchheimer Equation, Hydraulic Radius Model, Fractal Model and Experiment

et al. 2016

Fractals

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Numerical Analysis of Turbulent Fluid Flow and Heat Transfer in a Rectangular Elbow

Cited by 4 publications

References 28 publications

Effects of Cross Jet on Turbulent Main Stream Flow in A Non-Circular Elbow – A Numerical Approach

Effects of Cross Jet on Turbulent Main Stream Flow in A Non-Circular Elbow – A Numerical Approach

The Hysteresis and Shear Velocity in Unsteady Flows

A Review on Non-Darcy Flow — Forchheimer Equation, Hydraulic Radius Model, Fractal Model and Experiment

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