Purpose

The loading mechanism of textures considering turbulence has not been fully covered. This paper aims to investigate the effect of turbulence on the textured loading capacity under water lubrication and to analyze the causes of the turbulence effect.

Design/methodology/approach

Computational fluid dynamic models with different textured shapes are established after validation. The transition shear stress transport (SST) model, which is suitable for predicting the transition process of fluid from laminar state to turbulent state, is adopted in the present study. To illustrate the effect of turbulence, the loading capacity of textures predicted by transition SST model and laminar model is compared.

Findings

The loading capacity is higher after considering turbulence because more lubricant enters into textures and the flow rate of lubricant to textured outlet increases. There exists an optimal textured depth ratio and density for loading capacity and the change of flow state would not affect the optimal values. The degree of fluid blockage at textured outlet has a dominant influence on loading capacity. As the textured shape changes to triangle or ellipse from rectangle, the vortices at the textured bottom move forward and the blockage at a textured outlet is enhanced, which makes loading capacity improved under the action of blocking effect.

Originality/value

The enhancement of the blocking effect is found to be crucial to the improvement of textured loading capacity after considering turbulence. Present research provides references to understand the loading mechanism of textures under turbulent conditions.

Peer review

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0149/

中文翻译：

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水润滑条件下无限宽基本纹理单元的湍流和阻塞对载荷能力的影响分析

目的

考虑湍流的纹理的加载机制尚未完全涵盖。本文旨在研究湍流对水润滑下织构载荷能力的影响，并分析引起湍流作用的原因。

设计/方法/方法

验证后建立具有不同纹理形状的计算流体动力学模型。本研究采用了适合预测流体从层流状态到湍流状态过渡过程的切变应力传递模型。为了说明湍流的影响，比较了由过渡SST模型和层流模型预测的纹理的承载能力。

发现

考虑湍流后，负载能力更高，因为更多的润滑剂进入织构，并且润滑剂流向织构出口的流量增加。对于承载能力，存在最佳的纹理深度比和密度，并且流态的变化不会影响最佳值。纹理出口处的流体阻塞程度对负载能力具有主要影响。当纹理形状从矩形变为三角形或椭圆形时，纹理底部的漩涡会向前移动，并增强纹理出口处的阻塞，从而在阻塞效果的作用下提高了承载能力。

创意/价值

在考虑到湍流之后，发现增强阻挡作用对于提高织构的负载能力至关重要。本研究为理解湍流条件下纹理的加载机理提供了参考。

同行评审

本文的同行评审历史记录可在以下网址获得：https://publons.com/publon/10.1108/ILT-04-2020-0149/