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Abstract <p>Simulation of the developed laminar channel flow with a single-row array of inclined oval‑trench dimples with variable values of the trench length is carried out at the fixed dimple area and dimple depth. To evaluate the heat transfer enhancement, VP2/3 (Velocity–Pressure 2D/3D) in‑house code is used to solve Navier–Stokes and energy equations with the use of the multiblock computational technologies. The performed numerical analysis showed that four types of dimples with small, moderate, medium, and large values of the trench length could be distinguished. The flow and heat transfer features for small dimples are comparable to those of the spherical dimples with thermohydraulic efficiency of about 1.0. A significant change of the vortex structure is observed for moderate dimples which is accompanied with a significant increase of the thermohydraulic efficiency. For&#xa0;medium dimples a secondary separation area is formed whereas the thermohydraulic efficiency slightly grows. For large dimples the maximum value of the thermohydraulic efficiency of about 1.73&#xa0;is observed for the trench length of about 5.0 whereas it decreases for larger values of the trench length. The origin of the significant heat transfer intensification is attributed to the formation of the extraordinary static pressure difference between the dimple leading and trailing edges with the value normalized by the doubled dynamic pressure of about 0.35–0.4.</p>

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Anomalous Heat Transfer Enhancement for the Developed Laminar Channel Flow with a Single-row Array of Inclined Oval-trench Dimples with Variable Values of the Trench Length at the Fixed Dimple Depth and Spot Area

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • S. A. Isaev,
  • M. S. Gritckevich,
  • E. A. Osiuk,
  • D. V. Nikushchenko,
  • V. B. Kharchenko,
  • Dehai Kong

摘要

Abstract

Simulation of the developed laminar channel flow with a single-row array of inclined oval‑trench dimples with variable values of the trench length is carried out at the fixed dimple area and dimple depth. To evaluate the heat transfer enhancement, VP2/3 (Velocity–Pressure 2D/3D) in‑house code is used to solve Navier–Stokes and energy equations with the use of the multiblock computational technologies. The performed numerical analysis showed that four types of dimples with small, moderate, medium, and large values of the trench length could be distinguished. The flow and heat transfer features for small dimples are comparable to those of the spherical dimples with thermohydraulic efficiency of about 1.0. A significant change of the vortex structure is observed for moderate dimples which is accompanied with a significant increase of the thermohydraulic efficiency. For medium dimples a secondary separation area is formed whereas the thermohydraulic efficiency slightly grows. For large dimples the maximum value of the thermohydraulic efficiency of about 1.73 is observed for the trench length of about 5.0 whereas it decreases for larger values of the trench length. The origin of the significant heat transfer intensification is attributed to the formation of the extraordinary static pressure difference between the dimple leading and trailing edges with the value normalized by the doubled dynamic pressure of about 0.35–0.4.