Abstract
You should Three-dimensional simulation of a biodiesel fluid flow within a rectangular duct over a backward-facing step is investigated in the present paper. The fluid, which obeys to the Newtonian rheological behavior, is obtained by transformation of Algerian waste cooking oil into a biodiesel. Flow through a rectangular channel subjected to a constant wall temperature or constant heat flux as boundary conditions. The partial differential equations governing fluid flow and heat transfer are solved by the Fluent CFD computational code based on the Finite Volume Method. The numerical experiments are carried out to examine the effect of the Reynolds number by fluid inlet velocity variation for the two boundary conditions. The results are analyzed through the distribution of the temperature and the velocity contours. The variation of the Reynolds number and boundary conditions affects greatly the heat transfer and the fluid flow, in particular near the step region.
Highlights
The growing requirements for bio and renewable energy savings have motivated the development of lighter, more economic and efficient heat exchanger devices
That was produced in our laboratory under constant mixing and controlled temperature with a 6:1 fixed ratio of methanol / Algerian waste cooking oil, with 1% catalyst (KOH) by transesterification reaction
When we compare the two boundary conditions at constant Reynolds, we notice that the velocity distribution does not change much, when Reynolds number is gradually increased (100 ≼ Re ≼ 300), the flow separates at the edge of the step and a closed primary recirculation region is observed behind the step
Summary
The growing requirements for bio and renewable energy savings have motivated the development of lighter, more economic and efficient heat exchanger devices. The convective heat transfer and fluid flow over a backward facing step have been widely investigated both numerically [6]–[11] and experimentally [12]. We used the advantages offered by numerical modeling to study the three dimensional laminar viscous heating of biodiesel fluid flow through a backward-facing step. This investigation concerns the analysis of the effects of the Reynolds number by inlet velocity variation and boundary conditions on the temperature and velocity contours distributions and streamlines through the duct. Continuity, momentum and energy equations, given as follow: Continuity equation xi ui (1)
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