The effect of the geometric parameters of a perforated plate on its heat transfer characteristics

Cryogenics ◽  
1996 ◽  
Vol 36 (6) ◽  
pp. 443-446 ◽  
Author(s):  
Guo Tingwei ◽  
Zhu Tingying ◽  
Hu Jichuan ◽  
Gong Linghui
Keyword(s):  
Heat Transfer ◽  
Perforated Plate ◽  
Geometric Parameters ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics

Heat Transfer Characteristics for Inline and Staggered Arrays of Circular Jets with Crossflow of Spent Air

1979 ◽  
Vol 101 (3) ◽  
pp. 526-531 ◽  
Author(s):  
D. E. Metzger ◽  
L. W. Florschuetz ◽  
D. I. Takeuchi ◽  
R. D. Behee ◽  
R. A. Berry
Keyword(s):  
Heat Transfer ◽  
Nusselt Number ◽  
Heat Transfer Surface ◽  
Geometric Parameters ◽  
Channel Height ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Nusselt Numbers ◽  
Circular Jets ◽  
Impinging Flow

Heat transfer characteristics were measured for two-dimensional arrays of jets impinging on a surface parallel to the jet orifice plate. The impinging flow was constrained to exit in a single direction along the channel formed by the jet plate and the heat transfer surface. Both mean Nusselt numbers and streamwise Nusselt number profiles are presented as a function of Reynolds number and geometric parameters. The results show that significant periodic variations occur in the streamwise Nusselt number profiles, persisting downstream for at least ten rows of jet holes. Both channel height and hole spacing can have a significant effect on the streamwise profiles, smoothed across the periodic variations. Where significant differences exist, inline hole patterns provide better heat transfer than staggered ones, particularly downstream. These and other effects of the geometric parameters are presented and discussed.

scholarly journals Experimental Investigation on Impingement Heat Transfer From Rib Roughened Surface Within Arrays of Circular Jet: Effect of Geometric Parameters

1998 ◽  
Author(s):  
Chang Haiping ◽  
Zhang Jingyu ◽  
Huang Taiping
Keyword(s):  
Heat Transfer ◽  
Flux Ratio ◽  
Hole Diameter ◽  
Geometric Parameters ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Impingement Heat Transfer ◽  
Roughened Surface ◽  
Turbine Airfoils ◽  
Rib Roughened

Impingement heat transfer from rib roughened surface within two-dimensional arrays of circular jet with initial crossflow has been investigated experimentally. The configurations considered are intended to simulate the impingement cooled midchord region of the gas turbine airfoils in case where an initial crossflow is present. Many factors affect the heat transfer. The relative positions of the jet hole to the ribs and the geometric parameters have the significant effect on the heat transfer characteristics and have been experimentally studied. The investigation on the effect of the relative position of the jet hole to the ribs has been presented in an other paper. The effects of the geometric parameters such as jet hole spacing, jet-to-surface spacing, rib pitch-to-height ratio and rib height-to-hole diameter ratio on the heat transfer characteristics are considered in this paper. The experimentation is conducted under the conditions of Reynolds number 7,000–15,000 and the crossflow-to-jet mass flux ratio based on each channel/jet hole area 0∼0.5. With three jet hole spacing to jet hole diameter ratios, five jet-to-surface spacings, three rib pitch-to-height ratios and three rib height-to-hole diameter ratios, a great number of experimental data has been obtained. Based on this, the effects of the geometric parameters on the heat transfer characteristics have been obtained qualitatively and quantitatively. It can be used for evaluating the efficiency of the impingement heat transfer.

Effect of Helical Vane Swirler Geometry on Heat Transfer Characteristics for Compressed Natural Gas/Air Swirling Flame Impinging on a Flat Surface

2013 ◽  
Author(s):  
Subhash Chander ◽  
Gurpreet Singh
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Natural Gas ◽  
Flat Surface ◽  
Geometric Parameters ◽  
Heat Transfer Characteristics ◽  
Compressed Natural Gas ◽  
Transfer Characteristics ◽  
Swirl Intensity ◽  
Swirling Flame

An experimental study has been conducted to investigate the effect of helical vane swirler geometry on heat transfer characteristics for compressed natural gas (CNG)/air swirling flame impinging on a flat surface. Effects of helical vane swirler geometric parameters like, length of helical insert (25 mm, 45 mm and 65 mm), depth of groove on the helical insert (2.5 mm, 3.5 mm and 4.5 mm) and number of helical vanes (8, 10 and 12), on heat transfer characteristics have been studied. All the inserts were having fixed helical vane angle of 45°. Also, the burner exit diameter was kept constant (d = 20 mm). Experiments were conducted at different dimensionless separation distances (6, 4, 3 and 2) for fixed values of Reynolds number (6000) and equivalence ratio (1.3). Significant variation in the heat flux profiles has been observed for different swirler inserts till the radial hump in heat flux. After the radial hump, almost in all cases, the heat flux lines merged together. These variations in the heat flux profiles were due to different level of swirling intensities produced by different swirlers at fixed value of the helical vane swirler angle. It was observed that the heating was comparatively more uniform at larger separation distances (H/d = 6). It has been concluded that defining swirl intensity only with the helical vane swirler angle would be incorrect for such type of swirlers. Other geometric parameters of the swirler like, number of vanes, length of the swirler and the depth of the groove should also be included in swirl intensity definition.

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