05/02430 Experimental study of grease flow in pipelines: wall slip and air entrainment effects

2005 ◽  
Vol 46 (6) ◽  
pp. 359
Keyword(s):  
Experimental Study ◽  
Wall Slip ◽  
Air Entrainment ◽  
Grease Flow

An experimental study of flame height and air entrainment of buoyancy-controlled jet flames with sidewalls

Fuel ◽  
2016 ◽  
Vol 183 ◽  
pp. 164-169 ◽  
Author(s):  
C.F. Tao ◽  
Y. Shen ◽  
R.W. Zong ◽  
F. Tang
Keyword(s):  
Experimental Study ◽  
Air Entrainment ◽  
Flame Height ◽  
Jet Flames

Effects of Flame Lift-Off on the Differences Between the Diffusion Flames From Circular and Elliptic Burners

1998 ◽  
Vol 120 (2) ◽  
pp. 161-166 ◽  
Author(s):  
S. R. Gollahalli
Keyword(s):  
Experimental Study ◽  
Combustion Product ◽  
Axial Velocity ◽  
Diffusion Flames ◽  
Air Entrainment ◽  
Lifted Flames ◽  
The Mean ◽  
Lift Off ◽  
Product Species

An experimental study conducted to determine the effects of lifting the flame base off the burner rim on the differences between the flame characteristics of diffusion flames from circular and elliptic burners is presented. The in-flame profiles of temperature, concentrations of fuel and combustion product species, and the mean and fluctuating components of axial velocity are presented. This study has shown that the effects of burner geometry in turbulent lifted flames are considerable only in the near-burner region. In the midflame and far-burner regions, the effects traceable to burner geometry are much weaker, contrary to those observed in the attached flame configuration. The observations are attributed to the turbulence and additional air entrainment into the jet prior to the flame base accompanying the lift-off process, which mitigate the effects of burner geometry.

An experimental study of nozzle diameters, aeration depths and angles on standard aeration efficiency (SAE) in a venturi aerator

2009 ◽  
Vol 4 (3) ◽  
Author(s):  
M.R. Ghomi ◽  
M. Sohrabnejad ◽  
M. R. Ovissipour
Keyword(s):  
Experimental Study ◽  
Oxygen Transfer ◽  
Air Entrainment ◽  
Nozzle Diameter ◽  
Venturi Tube ◽  
Water Pump ◽  
Significant Difference ◽  
Oxygen Transfer Efficiency ◽  
Aeration Efficiency ◽  
Nozzle Size

A 1.1 kW submersible water pump with a venturi air injector was used in this study to examine the effects of three factors including nozzle diameter (14, 17 and 20 mm), aeration depth (20, 40 and 60 cm), and aeration angle (0, 22.5 and 45°) on standard aeration efficiency (SAE). For maximum air entrainment, HT / DT ratio and DT / DN ratio were equal to zero and 2, respectively. Among the first factor experiments, 14 mm nozzle diameter showed the highest SAE value (P<0.05). Although, 60 cm aeration depth and 45° aeration angle had more SAE value among other depths and angles, but there was not a significant difference (P>0.05) in each aeration depths and angles. Only, the determination coefficient for effect of nozzle diameters on SAE value showed a good result (R2= 0.958). The greatest oxygen transfer efficiency in this study has been achieved with using 14 mm nozzle size, 60 cm depth of aeration, and 45° angle of venturi tube in water aeration that was 1.166 kgO2/ kWh. Venturi aerators are very inexpensive in comparison with other aerators and have some other advantages that can be considered as one of the best devices for water aeration.

Experimental Study on Spray Characteristics of N-Butanol/Acidic Oil/Diesel Blends

2014 ◽  
Vol 1008-1009 ◽  
pp. 1001-1005 ◽  
Author(s):  
Jian Wu ◽  
Yang Hua ◽  
Zhan Cheng Wang ◽  
Li Li Zhu ◽  
Wei Wei Shang
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Cone Angle ◽  
Injection Pressure ◽  
Air Entrainment ◽  
Mixing Ratio ◽  
Spray Characteristics ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Spray Penetration

In order to better research on the spray characteristics of biodiesel and n-butanol blends, an experimental study of spray characteristics of different fuel mixtures was investigated in a constant volume vessel using high speed photograph method, and analyzed the influence of different proportions of acidic oil biodiesel and n-butanol on the macroscopic parameters of spray penetration, spray cone angle and so on. The results show that with the increase of acidic oil biodiesel ratio, the air entrainment is weakened, spray penetration gradually increases and spray cone angle decreases under the same injection pressure and back pressure. After adding n-butanol in acidic oil biodiesel and diesel mixture fuel, the surrounding air entrainment is enhanced, and spray front end widen. With the increase of mixing ratio, spray penetration increases first, then decreases. The spray cone angle increases after adding n-butanol, and decreases with the increase of mixing ratio. The results show that adding n-butanol can be used as one of the methods to improve biodiesel spray characteristics.

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