A case study on the dynamic process of water drop impacting on heated wood surface

Lan, Meijuan; Wang, Xishi

doi:10.1016/j.csite.2013.11.004

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…When a metal droplet impacts the solid surface, several phenomena occur, such as spreading, contracting, and bouncing. Also, the splashing occurs in the case when the impact speed of falling droplet is high enough to enable the secondary droplet to get rid of the surface tension of the original droplet (Lan 2014; Rein 1993). In PM, the Cu balls are created when the droplet impacts the ceramic within the steel container.…”

Section: Resultsmentioning

confidence: 99%

Production Techniques and Microstructures of Copper Granule: Experimental Analysis and Archaeological Case Study

Tan

Yang

et al. 2021

Archaeometry

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Granulation is a decorative technique for metalwork where tiny granules are used. Recent discoveries in China confirmed that pure copper granulation was employed as early as the seventh century CE. However, the production techniques for copper granule are still unknown. Herein, a systematic study is carried out to produce pure copper granules by using “pouring method”, “heating method”, and “crucible method” to investigate possible techniques of ancient times. The results reveal that copper granules can be produced by the same methods for ancient gold and silver granules. Furthermore, the granule rate during the pouring method is mainly influenced by the cooling media. In addition, the cooling rate and oxygen content significantly affect the microstructure of copper beads. Moreover, metallographic analysis of two archaeological granulated copper pieces of the seventh century CE is carried out to compare the microstructure of copper granules by different simulation experiments. The microstructural analysis indicates that the two ancient copper granules were most likely produced by the crucible method, which is also a preferred choice from the viewpoints of mass production and precise control of granule dimensions. The paper provides a point of departure for future research on the utilization of copper granules in ancient times.

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Section: Resultsmentioning

confidence: 99%

Production Techniques and Microstructures of Copper Granule: Experimental Analysis and Archaeological Case Study

Tan

Yang

et al. 2021

Archaeometry

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“…When the WE exceeded 564, bubbles began to form (Fan et al, 2018). In addition, Lan and Wang (2014) used experimental and numerical simulation methods to study the impaction of a single water droplet on the heated wood…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Liu

Tang

et al. 2021

Aerosol Air Qual. Res.

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The wall-attached fuel layer of the combustor usually leads to an unstable combustion and produces an unexpected emission, such as aerosol particles and unburn hydrocarbons. In this study, the impaction of ethanol droplet on a heated liquid surface was examined for investigating the factors those could effectively control the fuel atomization and avoided the formation of wall-attached fuel layer. We accelerated the volatilization of ethanol droplets after contacting the liquid surface and even achieved the flash evaporation condition to burst the oil layer, which was conducive to cleaning the inner wall of the combustors and reducing emissions. A 3.12-mm ethanol droplet was used to impact a glycerol pool. The Weber number (WE, 303-1343) and pool temperature (T, 50-260℃) were two controlled parameters to explore the impaction characteristics. There were four typical phenomena observed, including surface dissolving, penetrating dissolution, vapor explosions, and nucleate boiling. Results showed that the maximum volume and surface area of the crater increased with the WE and the liquid pool temperature during impaction. Meanwhile, the boundary temperatures between the penetrating dissolution and the vapor explosion decreased. Additionally, the vapor explosion time increased with the WE but negatively correlated to the liquid pool temperature. The entire vapor explosion process was very short, lasting about 200 millisecond. Furthermore, the increasing WE had a negative effect on the nucleate boiling intensity when the liquid pool temperature significantly enhanced it. Consequently, the fuel droplet atomization and explosion could be sensitively controlled by varying the WE and the temperature of impaction surface. This finding provides valuable information to the designer of combustor control unit to

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“…Droplet impact models usually specify the contact line boundary condition by assigning a solid–liquid contact angle which determines the liquid–gas interface shape near the contact line. Many studies have used an equilibrium solid–liquid contact angle, which is called a static contact angle in this work, as the assigning angle. − However, the apparent contact angle can differ greatly from the static contact angle during droplet impact due to the contact angle hysteresis. Fukai et al took the contact angle hysteresis effect into account by assigning a constant advancing contact angle and a constant receding contact angle.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Flow Dynamics and Evaporative Cooling of Water Droplets Impinging onto Heated Surfaces: An Effective Approach To Identify Spray Cooling Mechanisms

Chen

Zhang

et al. 2016

Langmuir

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Numerical investigations of the dynamics and evaporative cooling of water droplets impinging onto heated surfaces can be used to identify spray cooling mechanisms. Droplet impingement dynamics and evaporation are simulated using the presented numerical model. Volume-of-fluid method is used in the model to track the free surface. The contact line dynamics was predicted from a dynamic contact angle model with the evaporation rate predicted by a kinetic theory model. A species transport equation was solved in the gas phase to describe the vapor convection and diffusion. The numerical model was validated by experimental data. The physical effects including the contact angle hysteresis and the thermocapillary effect are analyzed to offer guidance for future numerical models of droplet impingement cooling. The effects of various parameters including surface wettability, surface temperature, droplet velocity, droplet size, and droplet temperature were numerically studied from the standpoint of spray cooling. The numerical simulations offer profound analysis and deep insight into the spray cooling heat transfer mechanisms.

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A case study on the dynamic process of water drop impacting on heated wood surface

Cited by 11 publications

References 20 publications

Production Techniques and Microstructures of Copper Granule: Experimental Analysis and Archaeological Case Study

Production Techniques and Microstructures of Copper Granule: Experimental Analysis and Archaeological Case Study

Inhibition of the Wall-attached Fuel Combustion and the Formation of Aerosol Particle

Numerical Investigation of the Flow Dynamics and Evaporative Cooling of Water Droplets Impinging onto Heated Surfaces: An Effective Approach To Identify Spray Cooling Mechanisms

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