Visualization of flow and heat transfer characteristics for swirling impinging jet

Nuntadusit, Chayut; Wae-hayee, Makatar; Bunyajitradulya, Asi; Eiamsa-ard, Smith

doi:10.1016/j.icheatmasstransfer.2012.03.002

Cited by 57 publications

(11 citation statements)

References 24 publications

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“…They reported that increased cross flow reduces the heat transfer rate and increases uniformity. Nuntadusit et al (2012) examined the heat transfer and flow characteristics of swirling impinging jet using twisted tape inserts of swirl number Sw = 0,0.4,0.62,0.78 and 0.94 and reported that high heat transfer is obtained for Sw = 0.4 than circular impinging jet and it has diminished for larger swirl number (Sw = 0.78 and 0.94). Eiamsa-ard et al (2015) investigated heat transfer characteristics of swirling jet with co and counter dual twisted tape inserts (CO-DSIJ and C-DSIJ) of varying twist ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Heat Transfer and Multi Objective Optimization of Swirling Jet Impingement on a Flat Surface

Illyas

Bapu²,

Rao

2019

JAFM

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The influence of swirling flow on distribution of wall heat transfer on a flat plate with helicoid swirl inserts is experimentally studied. The focus of the study is on the swirling effect imposed by helicoid surfaces. Six helicoid swirl inserts of single vane, double vanes and triple vanes with swirl number (Sw) of 0.75 and 1.1 are used in this study. The heat transfer measurements are made for the Reynolds number range of 12700 -32700 and for the nozzle exit to impinging plate distance (H/D) of 1, 2, 3 and 4 using thermo chromic liquid crystal technique. The swirling impinging jet is also compared with circular impinging jet on the heat transfer performance. The obtained experimental results provide the information on the behavior of single, double and triple helicoid swirl inserts on the heat transfer performance. The experimental values are analyzed with multi objective optimization technique of principle component analysis by computing multi response performance index (MRPI). Their performance is presented in terms of heat transfer rate through evaluation of Nusselt number on the impinging surface and heat transfer uniformity and decay of Nusselt number. The principle component analysis reveals that the double helicoid with higher H/D ratio improves performance of the swirling jet with relatively higher computed MRPI. It is found from the analysis of variance (ANOVA) that the H/D ratio contributes significant effect on the output followed by number of helicoid vanes and swirl number.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Heat Transfer and Multi Objective Optimization of Swirling Jet Impingement on a Flat Surface

Illyas

Bapu²,

Rao

2019

JAFM

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“…Nuntadusit et al the flow pattern impingement jet, heat transfer rate, and wall temperature distribution associated with straight and twisted tape inserts using thin oil film and thermochromic pigment. The same techniques have been used by Nuntadusit et al to study the flow characteristics and heat transfer rate associated with a symmetrical array of multiple conventional and swirl impingement jets with different jet‐to‐jet spacing. The results indicated that multiple swirl impingement jets give higher values of heat transfer rate compared with multiple conventional impingement jets for all jet‐to‐jet spacing.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of heat transfer of impingement system with swap swirl generator

Salman

2019

Heat Trans. Asian Res.

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This article presents the computational fluid dynamic simulation of the heat transfer characteristics induced by a swap swirl air-jet generator on the impingement surface. The study was carried out for conventional and swap twist tape inserts of twisted ratio y = 2.93 with various swap angles (α = 30°, 60°, 90°) at a constant distance of nozzle diameter impingement plate (L = 2D). The results show that the Nusselt number of the swirl impingement air-jet depends on the twisted tape swap angles and airflow rate. The results also showed that the swap angle of 90°gave notable uniform local heat transfer distribution compared with the typical twist tape and other swap twist tapes (α = 30°, 60°). In addition, the predicted results of the local heat transfer coefficient help explain the local turbulence intensity and generation to assist the industrial applications of swirl impingement air-cooling jet.

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“…They showed that at the largest twist ratio, the smallest b/D, and the highest jet Reynolds number, the maximum local/average Nusselt number on the impingement plate was occurred. Nuntadusit et al [14] studied the effect of the swirl number on the flow and heat transfer characteristics in an impinging jet on an impinged surface using straight and twisted tape inserts. They found that in y/w=3.64, the maximum heat transfer achieved.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the simultaneous influence of swirling flow and obstacles on plate in impinging jet

Zeiny¹,

Farhadi²,

Sedighi³

2017

IJHT

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Swirling effect of impinging jet on turbulent convective heat transfer over the hot plate containing obstacles was studied numerically. To create the swirling flow, input the twisted tape in the nozzle. The twisted number changes are 0 (straight tape), 5, 8, 10 and 12. Three arrangements of obstacles were used. Reynolds number equals to 20,000 and the distance ratios of impinging jet to the impingement plate (b/D) are 2 and 4. The results show that in without obstacle mode in b/D=2, the highest heat-transfer rate happens to use the twisted tape with 12 twists. At b/D=4, by increasing the twist number, the heat transfer decreases. By 12 twists for the impingement plate with one obstacle in b/D=2 the average Nusselt number increases 29 percent higher than the conventional impinging jet (CIJ) and in b/D=4, the heat transfer with swirling flow would be more than CIJ. For impingement plate with three and four obstacles, the swirling flow does not have sensible effect on the heat transfer.

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Visualization of flow and heat transfer characteristics for swirling impinging jet

Cited by 57 publications

References 24 publications

Experimental Analysis of Heat Transfer and Multi Objective Optimization of Swirling Jet Impingement on a Flat Surface

Experimental Analysis of Heat Transfer and Multi Objective Optimization of Swirling Jet Impingement on a Flat Surface

Characteristics of heat transfer of impingement system with swap swirl generator

Numerical investigation of the simultaneous influence of swirling flow and obstacles on plate in impinging jet

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