Experimental investigation of propagation of wetting front on curved surfaces exposed to an impinging water jet

Akmal, M.; Omar, Ahmad Maliki; Hamed, M.

doi:10.1504/ijmmp.2008.022042

Cited by 15 publications

(21 citation statements)

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“…Under transient cooling condition, at a certain spatial location, the rewetting parameters were determined in similar manner as reported earlier for horizontal flat surface [8][9][10]. Further, for any spatial location, the rewetting parameters were obtained with the surface temperature and Fig.…”

Section: Experimental Set Up and Proceduresmentioning

confidence: 90%

“…The nozzle (1) was connected through a hose pipe to the main water supply line on which a valve (14) was provided to regulate the water flow through the nozzle. To support the test section under vertical orientation a vertical attachment (8) was provided on horizontal movable table (15). The test section can be mounted between movable support (12) and adjustable screw (13) on the vertical movable base (9).…”

Section: Experimental Set Up and Proceduresmentioning

confidence: 99%

“…Researchers have reported theoretical [3][4][5] and experimental [6][7][8][9] investigations several times in the literature for this cooling method. The performance of jet impingement surface cooling has been examined for both steady state [10][11][12][13] and transient [6][7][8][9][14][15][16][17][18][19][20][21] cooling conditions. The cooling performance under transient condition is normally evaluated on the basis of surface rewetting [2,16,22].…”

Section: Introductionmentioning

confidence: 99%

“…The cooling performance under transient condition is normally evaluated on the basis of surface rewetting [2,16,22]. The rewetting temperature, wetting delay, rewetting velocity, maximum surface heat flux are few parameters on which the quenching method is evaluated [6][7][8][9]21]. The reported experimental work for surface rewetting, with the jet impingement cooling are for hot horizontal flat surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…The reported experimental work for surface rewetting, with the jet impingement cooling are for hot horizontal flat surfaces. These studies include the effect of change in jet diameter [15,18], jet flow rate [8,9,21], nozzle configuration [18,19], jet exit to surface spacing [14,17], surface initial temperature [2,8,21] etc. Though, few studies for vertical surface have also been observed, however these are primarily with air jet cooling methods [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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Rewetting of hot vertical rod during jet impingement surface cooling

et al. 2015

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List of symbolsA Test-surface area (m 2 ) Bi Biot number, hD/2k s CHF Critical heat flux c p Specific heat of the surface material (kJ/kg K) d Jet diameter (m) D Test surface diameter (m) h Heat transfer coefficient (W/m 2 K) k Thermal conductivity (W/m K) l Downstream spatial location on test surface (m) Q Water flow rate (lpm) q Surface heat flux (W/m 2 ) Re Reynolds number (Ud/υ) Rw Rewetting number or dimensionless rewetting velocity (uD/2α) r Radial distance from the stagnation point (m) t Time (s) t d Wetting delay (s) T Temperature (°C) u Rewetting velocity (m/s) v Volume of test-section (m 3 ) z/d Dimensionless nozzle exit to test surface spacing Greek symbols υ Kinematic viscosity of water (m 2 /s) α Thermal diffusivity of surface (m 2 /s) ρ Density of surface material (kg/m 3 ) Subscripts B Bottom side downstream location e Experimental value i Initial value j Jet MFB Minimum film boiling m MaximumAbstract A stainless steel (SS-316) vertical rod of 12 mm diameter at 800 ± 10 °C initial temperature was cooled by normal impinging round water jet. The surface rewetting phenomenon was investigated for a range of jet diameter 2.5-4.8 mm and jet Reynolds number 5000-24,000 using a straight tube type nozzle. The investigation were made from the stagnation point to maximum 40 mm downstream locations, simultaneously for both upside and downside directions. The cooling performance of the vertical rod was evaluated on the basis of rewetting parameters i.e. rewetting temperature, wetting delay, rewetting velocity and the maximum surface heat flux. Two separate Correlations have been proposed for the dimensionless rewetting velocity in terms of rewetting number and the maximum surface heat flux that predicts the experimental data within an error band of ±20 and ±15 % respectively.

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Section: Experimental Set Up and Proceduresmentioning

confidence: 90%