Effect of slip and thermal gradient on micropolar nano suspension flow across a moving hydrogen fuel-cell membrane.

The present article examines the micropolar fluid flow with nanofluid suspension across porous stretching/shrinking surfaces with added heat transfer through heat source/sink and radiation. The situation arises in the electrolytic fluid flow across fuel-cell membranes in advanced batteries or fuel cells. To understand the flows and the efficacy of the fuel cell, we study the fluid dynamics of the flow across such shrinking/stretching membranes by converting the non-dimensional governing partial differential equations to ordinary differential equations by using suitable similarity transforms. The energy equation is then analytically solved using hypergeometric series. It is noted that there is a lack of study on nanofluids in the circumstances of micropolar and radiation with porous media. The novelty of the present problem is to examine the influence of micropolar nanofluid flow with heat transfer over permeable surfaces. Analyses show that increasing the rate of shrinking/stretching boundary and increasing the Darcy number decreases the velocity of the fluid while increasing the Eringen number decreases the skin friction decreases dramatically, and increasing the thermal radiation and heat source/sink parameters enhances the thermal boundary layer. Other variations of parameters are also studied and explained graphically. The current work has many useful implications in efficient fuel-cell developments, developing nanofluid has significantly improved the heat transmission process for manufacturing with applications in engineering, biological, and physical sciences. • The present article studies the micropolar nanofluid flow across porous surfaces. • Heat transfer was studied by adding radiation to the energy equation. • Temperature increases due to rising the values of volume fraction. • Momentum and energy equations contain velocity slip and temperature jump boundary conditions. • Both momentum and energy equations are solved analytically. [ABSTRACT FROM AUTHOR]