The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity
This article presents the results of numerical investigation of the influence of the streamlined body temperature on drag force and on the falling velocity in a water channel. The experimental data reflecting the cooling dynamics and body temperature influence on the falling velocity are presented a...
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doaj-9893798bf0f9443fb3fda242d309dbf32021-02-10T00:02:44ZengMDPI AGApplied Sciences2076-34172021-02-01111562156210.3390/app11041562The Influence of Boiling on the Streamlined Body Drag Force and Falling VelocityLinas Paukštaitis0Sigitas Kilikevičius1Ramūnas Česnavičius2Kristina Liutkauskienė3Tadas Ždankus4Department of Thermal and Nuclear Energy, Kaunas University of Technology, Studentų St. 56, 51424 Kaunas, LithuaniaDepartment of Transport Engineering, Kaunas University of Technology, Studentų St. 56, 51424 Kaunas, LithuaniaDepartment of Mechanical Engineering, Kaunas University of Technology, Studentų St. 56, 51424 Kaunas, LithuaniaDepartment of Mechanical Engineering, Kaunas University of Technology, Studentų St. 56, 51424 Kaunas, LithuaniaCivil Engineering and Architecture Competence Centre, Kaunas University of Technology, Studentų St. 48, 51367 Kaunas, LithuaniaThis article presents the results of numerical investigation of the influence of the streamlined body temperature on drag force and on the falling velocity in a water channel. The experimental data reflecting the cooling dynamics and body temperature influence on the falling velocity are presented as well. <i>k</i> − <i>ε</i> turbulence model and homogenous heat transfer model were chosen for the numerical 3D simulation. Drag force changes induced by the alteration of the body temperature were investigated. Velocity of the streamlined body under different temperatures of water was investigated experimentally, and the results were compared to the data obtained during the numerical simulation. The increase of the falling velocity and decrease of drag force were found to have been affected by the increase of the body temperature, which had influence on the change of the water parameters (density, phase, etc.) near the surface of the body. Simulation showed that the drag force and a velocity also depended on the water temperature. The drag force of the streamlined body decreased by 32% in comparison to the cold body for the body temperature equal to 150 °C and water temperature close to the saturation temperature (98 °C). Experimentally, it was determined that the velocity of the streamlined body covered by vapor film depended on the falling time and increased by 10–30%. Velocity difference was very small for the cold and hot bodies at the initial moment of the drop; however, it reached 20% and more after 0.3 s of the falling process.https://www.mdpi.com/2076-3417/11/4/1562drag forcefalling velocitynumerical simulationcooling processturbulence modelhomogenous heat transfer model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Linas Paukštaitis Sigitas Kilikevičius Ramūnas Česnavičius Kristina Liutkauskienė Tadas Ždankus |
spellingShingle |
Linas Paukštaitis Sigitas Kilikevičius Ramūnas Česnavičius Kristina Liutkauskienė Tadas Ždankus The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity Applied Sciences drag force falling velocity numerical simulation cooling process turbulence model homogenous heat transfer model |
author_facet |
Linas Paukštaitis Sigitas Kilikevičius Ramūnas Česnavičius Kristina Liutkauskienė Tadas Ždankus |
author_sort |
Linas Paukštaitis |
title |
The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity |
title_short |
The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity |
title_full |
The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity |
title_fullStr |
The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity |
title_full_unstemmed |
The Influence of Boiling on the Streamlined Body Drag Force and Falling Velocity |
title_sort |
influence of boiling on the streamlined body drag force and falling velocity |
publisher |
MDPI AG |
series |
Applied Sciences |
issn |
2076-3417 |
publishDate |
2021-02-01 |
description |
This article presents the results of numerical investigation of the influence of the streamlined body temperature on drag force and on the falling velocity in a water channel. The experimental data reflecting the cooling dynamics and body temperature influence on the falling velocity are presented as well. <i>k</i> − <i>ε</i> turbulence model and homogenous heat transfer model were chosen for the numerical 3D simulation. Drag force changes induced by the alteration of the body temperature were investigated. Velocity of the streamlined body under different temperatures of water was investigated experimentally, and the results were compared to the data obtained during the numerical simulation. The increase of the falling velocity and decrease of drag force were found to have been affected by the increase of the body temperature, which had influence on the change of the water parameters (density, phase, etc.) near the surface of the body. Simulation showed that the drag force and a velocity also depended on the water temperature. The drag force of the streamlined body decreased by 32% in comparison to the cold body for the body temperature equal to 150 °C and water temperature close to the saturation temperature (98 °C). Experimentally, it was determined that the velocity of the streamlined body covered by vapor film depended on the falling time and increased by 10–30%. Velocity difference was very small for the cold and hot bodies at the initial moment of the drop; however, it reached 20% and more after 0.3 s of the falling process. |
topic |
drag force falling velocity numerical simulation cooling process turbulence model homogenous heat transfer model |
url |
https://www.mdpi.com/2076-3417/11/4/1562 |
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