Impact of the square rib on flow dynamics and thermal performance in the microchannel

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Numerical investigation reveals flow separation and thermal performance changes at varying Reynolds numbers in a microchannel.

Flow separation occurs at increasing Reynolds numbers, causing significant changes in flow dynamics and thermal characteristics.
At low Reynolds numbers, steady flow is observed with minimal recirculation, while higher values lead to complex vortex shedding.
The critical Reynolds number for transition to unsteady flow is identified between 900 and 1000, marked by vortex shedding changes.
Analysis of heat transfer metrics shows that local heat transfer coefficients and Nusselt numbers vary greatly across Reynolds numbers.

Raj et al. (2025) studied this question.

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