Numerical Investigation of Convective Heat Transfer and Friction in Solar Air Heater with Thin Ribs

• 作者: Sanjay K.Sharma V.R.Kalamkar
• 来源期刊: 工程与科学中的计算机建模(英文)
• 学科: 物理学
• 关键词: CFD 3D heat TRANSFER FRICTION factor
• 年，卷（期）: 2018,（3）
• 页码范围: 295-319
• 页数: 25页
• 分类号: O35

摘要

The three-dimensional numerical investigation of an incompressible flow through rib roughened solar air heater is carried out.A combination of thin transverse and truncated ribs is attached on the absorber plate to study its effect on the heat transfer and friction factor.The parameters in the form of Reynolds number(Re)of 4000-16000,relative roughness pitch(P/e)of 8-18 and relative roughness height(e/Dh)of 0.0366-0.055 is considered for the analysis.The CFD code ANSYS FLUENT is used to solve the governing equations of turbulent flow.The RNG k-εturbulence model is used to solve the transport equations with enhanced wall treatment,keeping the Y+<1.The maximum enhancement ratio of the Nusselt number and friction factor obtained is 1.91 and 3.61 respectively.The detailed investigation on average heat transfer,friction factor and flow structures have been discussed.