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<p>concentration of a chemical substance is transferred a <a href="page.php?w=semipermeable_membrane">semipermeable membrane</a> is used.</p>

<p><big> Cocurrent flow--half transfer </big></p>
<p><a href="page.php?w=Image%3AComparison_of_con-_and_counter-current_flow_exchange.svg">thumb</a>In the cocurrent flow exchange mechanism, the two fluids flow in the same direction.</p>

<p>As the cocurrent and countercurrent exchange mechanisms diagram showed, a cocurrent exchange system has a variable gradient over the length of the exchanger. With equal flows in</p><p>
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