An exact analytical solution for convective heat transfer in rectangular ducts

作者：Shahmardan Mohammad Mohsen; Norouzi Mahmood^*; Kayhani Mohammad Hassan; Delouei Amin Amiri

来源：Journal of Zhejiang University-Science A(Applied Physics & Engineering), 2012, 13(10): 768-781.

DOI：10.1631/jzus.A1100122

• Exact analytical solution
• Convective heat transfer
• Straight duct
• Rectangular cross-section
• Constant heat flux

An exact analytical solution is obtained for convective heat transfer in straight ducts with rectangular cross-sections for the first time. This solution is valid for both H1 and H2 boundary conditions, which are related to fully developed convective heat transfer under constant heat flux at the duct walls. The separation of variables method and various other mathematical techniques are used to find the closed form of the temperature distribution. The local and mean Nusselt numbers are also obtained as functions of the aspect ratio. A new physical constraint is presented to solve the Neumann problem in non-dimensional analysis for the H2 boundary conditions. This is one of the major innovations of the current study. The analytical results indicate a singularity occurs at a critical aspect ratio of 2.4912 when calculating the local and mean Nusselt numbers.

• 出版日期2012-10