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A numerical work is executed to investigate the thermal and fluidic behavior for forced convective laminar flow in a backward facing step (BFS) channel for fluids by varying Prandtl numbers (Pr). The outcomes are illustrated for the following parameter ranges: Reynolds number (Re) from 5 to 200 and Pr from 0.72 to 100. It is found that increasing Pr gradually decreases the thermal boundary layer thickness in the recirculation zone for lower Re although this reduction becomes more pronounced at higher Re. There is an increase of the length and size of recirculation zones with Re. At a given Re, an increase in the Pr is associated with a corresponding augmentation in mean Nusselt number ( \(\overline{{\varvec{N}}{\varvec{u}} }\) ). Nevertheless, the increase in heat transfer is more substantial at higher Pr values in comparison to lower Pr.

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Analysis of Hydrothermal Performance in Backward Facing Step for Fluids with Distinct Prandtl Number

  • 会议论文

  • 发表日期：

    2025年

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  • Saurav Kumar,
  • Sukumar Pati

摘要

A numerical work is executed to investigate the thermal and fluidic behavior for forced convective laminar flow in a backward facing step (BFS) channel for fluids by varying Prandtl numbers (Pr). The outcomes are illustrated for the following parameter ranges: Reynolds number (Re) from 5 to 200 and Pr from 0.72 to 100. It is found that increasing Pr gradually decreases the thermal boundary layer thickness in the recirculation zone for lower Re although this reduction becomes more pronounced at higher Re. There is an increase of the length and size of recirculation zones with Re. At a given Re, an increase in the Pr is associated with a corresponding augmentation in mean Nusselt number ( \(\overline{{\varvec{N}}{\varvec{u}} }\) ). Nevertheless, the increase in heat transfer is more substantial at higher Pr values in comparison to lower Pr.