Numerical investigations of a turbulent flow over triple forward facing step

Taher, Ahmed M.; Adam, Ihab G.

doi:10.1109/iccae.2010.5451440

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…Volume 14 • Number 4 • 2017 • 263-278 found to be fine enough to confirm the grid independent solution. A good agreement was obtained between the present results and those of Taher and Adam (2010) as can be seen in Figures 2 and 3. In addition, another comparison was made by means of Nusselt number, skin friction coefficient, and velocity distribution with the results of Mohammed et al (2011) and an excellent agreement was shown, as it is clear from Figures 4-6.…”

Section: World Journal Of Engineeringsupporting

confidence: 89%

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Turbulent forced convection flow of nanofluids over triple forward facing step

Hashim

Yusoff²,

Mohammed

2017

WJE

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Purpose The purpose of this paper is to numerically study the phenomenon of separation and subsequent reattachment that happens due to a sudden contraction or expansion in flow geometry, in addition, to investigating the effect of nanoparticles suspended in water on heat transfer enhancement and fluid flow characteristics. Design/methodology/approach Turbulent forced convection flow over triple forward facing step (FFS) in a duct is numerically studied by using different types of nanofluids. Finite volume method is employed to carry out the numerical investigations. with nanoparticles volume fraction in the range of 1-4 per cent and nanoparticles diameter in the range 30-75 nm, suspended in water. Several parameters were studied, such as the geometrical specification (different step heights), boundary conditions (different Reynolds [Re] numbers), types of fluids (base fluid with different types of nanoparticles), nanoparticle concentration (different volume fractions) and nanoparticle size. Findings The numerical results indicate that the Nusselt number increases as the volume fraction increases, but it decreases as the diameter of the nanoparticles of nanofluids increases. The turbulent kinetic energy and its dissipation rate increase as Re number increases. The velocity magnitude increases as the density of nanofluids decreases. No significant effect of increasing the three steps heights on Nusselt along the heated wall, except in front of first step where increasing the first step height leads to an increase in the recirculation zone size adjacent to it. Research limitations/implications The phenomenon of separation and subsequent reattachment happened due to a sudden contraction or expansion in flow geometry, such as forward facing and backward facing steps, respectively, can be recognized in many engineering applications where heat transfer enhancement is required. Some examples include cooling systems for electronic equipment, heat exchanger, diffusers and chemical process. Understanding the concept of these devices is very important from the engineering point of view. Originality/value Convective heat transfer can be enhanced passively by changing flow geometry, boundary conditions, the traditional fluids or by enhancing thermal conductivity of the fluid. Great attention has been paid to increase the thermal conductivity of base fluid by suspending nano-, micro- or larger-sized particles in fluid. The products from suspending these particles in the base fluid are called nanofluids. Many studies have been conducted to investigate the heat transfer and fluid flow characteristics over FFS. This study is the first where nanofluids are employed as working fluids for flow over triple FFS.

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Section: World Journal Of Engineeringsupporting

confidence: 89%

“…The results revealed that the second step can be used as control device for both heat transfer and fluid flow. Taher and Adam (2010) conducted simulations to investigate turbulent forced convection heat transfer flow over triple FFS. The working fluid was air and FLUENT was employed to perform the simulations.…”

Section: Introductionmentioning

confidence: 99%

Turbulent forced convection flow of nanofluids over triple forward facing step

Hashim

Yusoff²,

Mohammed

2017

WJE

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“…[25], Yu and Choi [26] Xue and Xu [27], Xu and Yu [28], Murshed et al [29], Zhang et al [30], Hong et al [31], Kwak and Kim [32], Timofeeva et al [33], He et al [34], Lee et al [35,36], Li et al [37], Minsta et al [38], Murshed et al [39], Taher and Adam [40], Xie et al [41], and Saidur et al [42,43]. The first study investigated the nanofluid flow characteristics and thermal behavior over backward-facing step was presented by Abu-Nada [15].…”

Section: Introductionmentioning

confidence: 99%

The effect of nanofluids flow on mixed convection heat transfer over microscale backward-facing step

Kherbeet

Mohammed

Salman

2012

International Journal of Heat and Mass Transfer

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“…These nanoparticles can be for instance Al 2 O 3 , SiO 2 , Cu, CuO, ZnO and TiO 2 [18]. Many researchers have investigated the effects of nanofluids in the enhancement of heat transfer and the fluid flow [19][20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%