Numerical Investigation of Flow and Heat Transfer Characteristics Inside a Tube with Bio-Inspired Shark Skin Denticles

Song Xia; Li Feng; Yue Bao; Li Huiling; Sun Xihui; Zhang Chaochao; Ren Jianhua

doi:10.12465/issn.0253-4339.20250611001

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Numerical Investigation of Flow and Heat Transfer Characteristics Inside a Tube with Bio-Inspired Shark Skin Denticles

更新时间：2026-10-13

- Numerical Investigation of Flow and Heat Transfer Characteristics Inside a Tube with Bio-Inspired Shark Skin Denticles
- Journal of Refrigeration Vol. 47, Issue 5, Pages: 160-172(2026)
- 作者机构：
  
  1.广东省建筑楼宇热储能技术重点实验室 528311 佛山
  2. 广东美的暖通设备有限公司 528311 佛山
- 作者简介：
  
  Yue Bao， male， senior engineer， Director of Midea HVAC & Building Technologies Division Research and Development Center， 86-13250354390， E-mail： yuebao@midea.com. Research fields： refrigeration and equipment energy-saving technology， smart building HVAC system.
- 基金信息：
- DOI：10.12465/issn.0253-4339.20250611001
  CLC： TB61⁺1;TK124.4
- Received：11 June 2025，
  
  Revised：2025-08-16，
  
  Accepted：18 August 2025，
  
  Published：16 October 2026
- 稿件说明：
移动端阅览
宋霞,李丰,岳宝等.仿生鲨鱼肤齿管内流动传热特性研究[J].制冷学报,2026,47(05):160-172.

Song Xia,Li Feng,Yue Bao,et al.Numerical Investigation of Flow and Heat Transfer Characteristics Inside a Tube with Bio-Inspired Shark Skin Denticles[J].Journal of Refrigeration,2026,47(05):160-172.
宋霞,李丰,岳宝等.仿生鲨鱼肤齿管内流动传热特性研究[J].制冷学报,2026,47(05):160-172. DOI： 10.12465/issn.0253-4339.20250611001.

Song Xia,Li Feng,Yue Bao,et al.Numerical Investigation of Flow and Heat Transfer Characteristics Inside a Tube with Bio-Inspired Shark Skin Denticles[J].Journal of Refrigeration,2026,47(05):160-172. DOI： 10.12465/issn.0253-4339.20250611001.

摘要

借鉴鲨鱼皮肤表面天然形成的沟槽状结构的减阻效应，本文提出了仿生鲨鱼肤齿结构，并评估了其在管内单相流动中的强化传热和减阻效果。仿生鲨鱼肤齿由沿主流流向突起的长条肋齿和流线型附齿组成，通过嵌合式交错有规律地排布在管内表面，由此形成了有规律的流动沟槽，能够将壁面附近涡流约束在沟槽内部，防止壁面流向涡的横向迁移，减小了涡横向迁移所引起的动量交换，由此起到减阻效果。此外，肤齿能够有效起到扰流作用，增强壁面对流传热效应，由此带来传热系数的提升。结果表明：影响鲨鱼肤齿减阻提效效果的主要因素是肤齿高度和排布密集程度，随着肤齿高度和肤齿排布密集程度的增加，扰流作用越显著，传热系数的提升效果增强，但减阻效果都会经历一个先增强后减弱的过程，因此存在一个较优的肤齿高度和排布密集程度；在本文所研究的7 mm外径管条件下，在管内流动雷诺数为4 500~9 500时，鲨鱼肤齿的较优齿高为0.07 mm，较优的肋齿间距

和

分别为2.3 mm和0.6 mm。与光管相比，带鲨鱼肤齿的内齿管的减阻效果达到约3.0%，传热能力提升约8.0%。

Abstract

Inspired by the drag-reducing effect of natural riblet-like structures on shark skin， this study proposes a biomimetic shark skin denticle structure and evaluates its heat transfer enhancement and drag reduction performance in the single-phase flow regime. The bio-inspired denticles consist of longitudinally protruding riblets and streamlined auxiliary riblets arranged in an interlocking， staggered pattern along the inner tube surface. This configuration forms well-organized flow channels that effectively confine near-wall vortices within the grooves， preventing the transverse migration of wall-flow vortices and reducing the momentum exchange caused by vortex cross-flow， thereby achieving drag reduction. Furthermore， denticles generate flow disturbances that enhance the convective heat transfer， leading to improved heat transfer coefficients. The primary factors affecting drag reduction and thermal performance were the denticle height and arrangement d

ensity. As the denticle height increased and the arrangement became more compact， the flow disturbance intensified， resulting in a greater heat transfer enhancement. However， the drag reduction effect was initially improved and then deteriorated， indicating the existence of an optimum denticle height and arrangement density. For the studied tube with a 7 mm outer diameter at Reynolds numbers ranging from 4 500 to 9 500， the optimum denticle height was determined to be 0.07 mm， with optimal riblet spacings

and

of 2.3 mm and 0.6 mm， respectively. Compared to a smooth tube， the sharkskin denticle tube achieved an approximately 3.0% reduction in flow resistance and an 8.0% improvement in heat transfer capacity.

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references

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