Experimental Study of Leidenfrost Phenomena at Hot Sprayed Surface

2003 ◽  
Author(s):  
M. Raudensky´ ◽  
J. Horsky´ ◽  
V. Dumek ◽  
P. Kotrba´cˇek
Keyword(s):  
Experimental Study ◽  
Droplet Size ◽  
Impinging Jets ◽  
Spray Parameters ◽  
Surface Cooling ◽  
Two Phase ◽  
Coefficient Distribution ◽  
Flow Experiment ◽  
Leidenfrost Temperature ◽  
The Relationship

An experimental study was prepared to find the relationship between Leidenfrost temperature and droplet size and velocity of impinging jets. The study is done for the case of steel surface cooling with two-phase nozzles. The sprayed surface moves under the spray at a velocity of 1 m/min. Cooling experiments were done for initial temperature of 1250°C. Thermal experiments are transient: internal temperature is measured and surface temperature and heat transfer coefficient distribution is computed by the inverse task. Droplet size and velocity of the impinging jet was modified by setting water and air pressures at the input of the nozzle. Spray parameters for each pressure combination was measured using a laser-doppler anemometer. The paper shows the results of the thermal and fluid flow experiment and the correlation between Leidenfrost temperature and flow parameters.The application of obtained results is expected for high temperature cooling especially in continuous casting.

scholarly journals Numerical Study on the Influence of Shaping Air Holes on Atomization Performance in Pneumatic Atomizers

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 410 ◽  
Author(s):  
Wentao Li ◽  
Lijuan Qian ◽  
Shaobo Song ◽  
Xiaokai Zhong
Keyword(s):  
Droplet Size ◽  
Numerical Study ◽  
Droplet Size Distribution ◽  
Target Surface ◽  
Central Pressure ◽  
Gas Velocity ◽  
Two Phase ◽  
Atomization Performance ◽  
The Relationship ◽  
Spraying Process

In pneumatic atomizers, the shaping air holes play an important role in the spraying system. The pressure and intersection of shaping air holes are the two most important parameters in engineering. In this paper, the Euler–Lagrangian method is used to describe the two-phase spray flow. The spraying process of the pneumatic nozzle is simulated numerically, and the experiment is designed to verify this simulation. By setting different air pressures and distances between the intersection and the paint hole, target surface pressure and droplet size distribution are investigated in detail, in order to explore the relationship between shaping air holes in pneumatic nozzles and overspray. From the results of the numerical simulation, it is found that an increase in the distance between the intersection and the paint hole increases the gas velocity at the central axis of the nozzle and the central pressure of the target surface, the droplet size becomes larger, and the distribution of droplets is more concentrated on the target surface, which easily leads to overspray. With the increase in the pressure of the shaping air holes, the central pressure of the target surface decreases, and the ovality of the spraying pattern on the target surface increases.

The role of economic conditions on humor generation and attitude towards humorous TV commercials

2016 ◽  
Vol 29 (4) ◽  
Author(s):  
Leonidas Hatzithomas ◽  
Christina Boutsouki ◽  
Yorgos Zotos
Keyword(s):  
Experimental Study ◽  
Economic Conditions ◽  
Two Phase ◽  
Economic Context ◽  
Low Levels ◽  
Tv Commercials ◽  
The Relationship

AbstractA two-phase experimental study investigates the role of economic conditions on humor generation and on the relationship between perceived humor and attitude toward the ad (Aad). It designates that the economic context affects the generation of humor and the relationship between perceived humor and Aad; TV commercials can more effectively create humor as well as positive Aad in an expansion rather than in a recession. The generation of humor during a recession, requires a combination of high levels of perceived surprise and low levels of perceived irritation. In the same vein, attitude towards a humorous ad, in a recession, increases significantly only when there is high perceived humor and low perceived irritation. Specific managerial and theoretical implications are discussed.

Experimental Study of Particle Size, Sound Velocity, and Resonance Phenomena in a Two-Phase Foam Flow

2001 ◽  
Vol 32 (4-6) ◽  
pp. 5
Author(s):  
A. P. Sevast'yanov ◽  
I. V. An ◽  
S. I. Vainshtein ◽  
Yu. A. Sevast'yanov ◽  
A. V. Sidnev ◽  
...  
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Sound Velocity ◽  
Two Phase ◽  
Foam Flow ◽  
Resonance Phenomena

EXPERIMENTAL STUDY ON VOID FRACTION OF ECCS TWO-PHASE FLOW

2017 ◽  
Author(s):  
Guojun Yu ◽  
Wuyue Ren ◽  
Jiawei Bian ◽  
G. H. Su ◽  
Wenxi Tian ◽  
...  
Keyword(s):  
Experimental Study ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase

Quantity judgment and the mass-count distinction across languages: Advances, problems, and future directions for research

2018 ◽  
Author(s):  
David Barner ◽  
Alan Bale
Keyword(s):  
Experimental Study ◽  
Judgment Task ◽  
Scientific Enterprise ◽  
Future Directions ◽  
Quantity Judgment ◽  
The Relationship ◽  
Linguistic Cognition

We review advances in the experimental study of the mass-count distinction and highlight problems that have emerged. First, we lay out what we see to be the scientific enterprise of studying the syntax and semantics of mass-count distinction, and the assumptions we believe must be made if additional progress is to occur, especially as the empirical facts continue to grow in number and complexity. Second, we discuss the new landscape of cross-linguistic results that has been created by widespread use of the quantity judgment task, and what these results tell us about the nature of the mass-count distinction. Finally, we discuss the relationship between the mass-count distinction and non-linguistic cognition, and in particular the object-substance distinction.

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