Geometry dimple effect

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August undefined, 2024

WebSep 1, 2024 · In summary, directional friction effect has been observed in anisotropic surface texturing investigation [36], it is recognised that dimples geometry could be a major factor influencing friction behaviours. However, the mechanisms behind are still unclear, and the local friction response of dimple geometries needs to be further studied. WebOct 3, 2013 · Next, the effects of varying texture geometry characteristics, in particular texture zone circumferential/radial extent, dimple depth, and texture density on the bearing performance indices (load carrying capacity, friction torque, and friction coefficient) are studied, for a representative operating point.

(PDF) Effect of Dimples on Aircraft Wing - ResearchGate

Websimulated the effect of the geometry of dimples and the relative motion of surfaces on hydrodynamic lubrication performance, which indicated that bottom shapes with wedge and/or step bearings tend to yield thicker films. To improve tribological and lubrication performance of dimpled surfaces, the dimple features should be narrower than the contact WebDec 30, 2024 · Geometry model. The model used in this study was a 1:10 scale TR-08 high-speed maglev train consisting of a head and a tail car, and running on the Shanghai Maglev demonstration line. At full scale, both vehicles are 27.2 m long. ... The sides and bottoms dimples had little effect on the pressure coefficient of the train tail car. google sheets data validation based on input

An Experimental Investigation of Dimple Effect on the

WebIn the present work, a car model with different dimple geometry is simulated using k-ε turbulence modeling to determine its effect to the aerodynamics performance. Overall, … WebJan 1, 2024 · Effect of Dimple Geometry on Uni-Directional Sliding Wear Performance. Tribology is a multidisciplinary science of interacting surfaces in relative motion and … WebJun 7, 2024 · Keywords: dimple geometry, pipe, recirculation, flow resistance, pressure drop, flow rate, ... a comparison of flow rates through the various dimpled pipes will be made. The effect of dimple size on mass flow rate is provided in Figure 4, where dimple sizes vary from 0.125mm to a maximum of 2mm. It is found that very small dimples … google sheets data sorting

Study on the effect of dimple position on drag reduction of high …

Lubricants Free Full-Text Numerical Analysis of Friction …

Webof the effects of micro spherical and cylindrical dimples on the load-carrying capacity of the case of the journal bearing with axial groove, aiming to obtain the best lubrication … WebSep 1, 2016 · With the purpose of studying the effect of dimple geometry on friction, these dimple arrays have the same area density of 10.4%, and the total dimple area of 12.6 … chicken floss shopeeWebMar 15, 2024 · The effect of the dimples on the performance of the wind turbine is numerically investigated. ... As predicted, the graphs presented in Fig. 7 indicate that when the number of dimples decreases (i.e., the geometry approaches to the no-dimple blades) the values of torque for various dimple radiuses close to the torque value of original HAWT. google sheets data from website

"WebApr 12, 2015 · This study investigated the effect of varying parameters such as the width and depth of surface dimples on the friction coefficient and the maximum shear stress, which are critical factors for fretting fatigue performance. It was found that the dimple width has a greater effect on the friction coefficient than the dimple depth. " - Geometry dimple effect

Geometry dimple effect

Effect of Dimple Geometry on Uni-Directional Sliding …

WebFeb 11, 2024 · The effects of multi-scale micro-textured distribution patterns, such as dimple geometry shape, dimple size, and dimple density, on the contact tribological properties of interface morphology are investigated and a lubricated column pin-on-disc experiments is presented on non-steel and steel samples [16,17,18]. These results … WebSep 21, 2024 · Among the studied geometric parameters of the dimples, a semi-empirical model was given that has to be used within the dimples geometry used. It was found that the interaction between the height ( h ) and the diameter ( d ) of dimples is the only statistically significant factor influencing the tribological properties.

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WebFeb 20, 2024 · 3.4.3 Geometric Effects of Shallow Dimples on the Vorticity Transport. Regardless of whether the planform design or the wall slope (\(K_x\)) is altered, Figs. 18 and 21 both demonstrate that the dimple geometry primarily affects the vorticity transport and the generation of Reynolds stress within layer 2 of the turbulent boundary layer ... http://glc.ans.org/nureth-16/data/papers/14031.pdf

WebJul 1, 2016 · The effect of dimples geometry in the sliding surface on the tribological properties under starved lubrication conditions @article{Gada2016TheEO, title={The effect of dimples geometry in the sliding surface on the tribological properties under starved lubrication conditions}, author={Lidia Gałda and Jarosław Sȩp and Slawomir Prucnal ...

WebOct 21, 2024 · The dimple diameter has a certain influence on the COF behavior of the coated/textured samples. For a given dimple depth, the COF increased with the dimple diameter, behavior that Etsion and co-workers studied both theoretically and experimentally. 15,17–20 15. A. Kovalchenko et al. WebApr 10, 2024 · The dimple is effective in restricting the location and size of the laminar separation bubble, leading to robust and significantly improved aerodynamic …

WebMay 17, 2024 · This study changes the height of dimple for its effect on the heat transfer. It needs a computational domain to simulate turbulent flow. The geometry size of the domain is 490 mm long, 245 mm wide, and 34 mm high. The heat source is placed on the bottom of channel from inlet 98 mm in the X direction and 98 mm from both sides of the channel wall.

WebDimples are small concavities imprinted on a flat surface, known to affect heat transfer and also flow separation and aerodynamic drag on bluff bodies when acting as a standard roughness. Recently, dimples have been proposed as a roughness pattern that is capable of reducing the turbulent drag of a flat plate by providing a reduction of skin friction that … google sheets data validation multiple choiceWebApr 13, 2024 · Acceleration toward critical Re transition by around 1000 was achieved by the application of elliptical dimple roughness. The effect of artificial roughness geometry on increasing the heat transfer rate was explored by García et al. . Three enhancement techniques were investigated: ribbed tubes, tubes with dimples, and helical wires on the ... google sheets date difference in daysWebJan 16, 2024 · The numerical study emphasizes the effect of Reynolds number and geometric shapes on load-bearing capacity, pressure distribution, and friction force of the … google sheets data validation formulaWebThe introduction of external surface features on mating contact surfaces is an effective method to reduce friction and wear between the contact surfaces. The tribological … google sheets data validation checkboxWebJun 30, 2024 · This paper is devoted to the analysis of effects of the dimple geometry on the hydrodynamic characteristics of a tilting pad thrust bearing. In a first step a … chicken floss singaporeWebComparing the friction reduction effect, the elliptical dimples showed the best performance, the square dimples showed the second best results, and the circular dimples performed worst. However, as the test load increased, the fric-tion reduction effect of all dimple shapes decreased; moreover, the differences between the shapes became smaller. google sheets data validation dynamic rangeWebApr 12, 2015 · This study investigated the effect of varying parameters such as the width and depth of surface dimples on the friction coefficient and the maximum shear stress, … google sheets date add month