119 lines
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119 lines
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<div id="projectname">EPANET
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 <span id="projectnumber">2.2.0</span>
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<div class="title">[REACTIONS] </div> </div>
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<div class="textblock"><p><b>Purpose:</b></p>
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<p>Defines parameters related to chemical reactions occurring in the network.</p>
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<p><b>Formats:</b></p>
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<p><b>   ORDER  BULK / WALL / TANK  </b> <em>value</em></p>
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<p><b>   GLOBAL  BULK / WALL  </b> <em>value</em></p>
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<p><b>   BULK / WALL  </b>  <em>pipeID</em>  <em>value</em></p>
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<p><b>   TANK  </b>  <em>tankID</em>  <em>value</em></p>
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<p><b>   LIMITING POTENTIAL  </b>  <em>value</em></p>
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<p><b>   ROUGHNESS CORRELATION  </b>  <em>value</em></p>
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<p><b>Definitions:</b></p>
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<p><b>ORDER</b> is used to set the order of reactions occurring in the bulk fluid, at the pipe wall, or in tanks, respectively. Values for wall reactions must be either 0 or 1. If not supplied the default reaction order is 1.0.</p>
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<p><b>GLOBAL</b> is used to set a global value for all bulk reaction coefficients (pipes and tanks) or for all pipe wall coefficients. The default value is zero.</p>
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<p><b>BULK, WALL,</b> and <b>TANK</b> are used to override the global reaction coefficients for specific pipes and tanks.</p>
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<p><b>LIMITING POTENTIAL</b> specifies that reaction rates are proportional to the difference between the current concentration and some limiting potential value.</p>
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<p><b>ROUGHNESS CORRELATION</b> will make all default pipe wall reaction coefficients be related to pipe roughness in the following manner: </p><table class="markdownTable">
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<tr class="markdownTableHead">
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<th class="markdownTableHeadNone">Head Loss Equation </th><th class="markdownTableHeadNone">Roughness Correlation </th></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">Hazen-Williams </td><td class="markdownTableBodyNone"><b>F / C</b> </td></tr>
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<tr class="markdownTableRowEven">
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<td class="markdownTableBodyNone">Darcy-Weisbach </td><td class="markdownTableBodyNone"><b>F / log(e/D)</b> </td></tr>
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<tr class="markdownTableRowOdd">
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<td class="markdownTableBodyNone">Chezy-Manning </td><td class="markdownTableBodyNone"><b>F * n</b> </td></tr>
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</table>
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<p>where <b>F</b> = roughness correlation, <b>C</b> = Hazen-Williams C-factor, <b>e</b> = Darcy-Weisbach roughness, <b>D</b> = pipe diameter, and <b>n</b> = Chezy-Manning roughness coefficient. The default value computed this way can be overridden for any pipe by using the <b>WALL</b> format to supply a specific value for the pipe.</p>
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<p><b>Remarks:</b></p><ol type="1">
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<li>Remember to use positive numbers for growth reaction coefficients and negative numbers for decay coefficients.</li>
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<li>The time units for all reaction coefficients are 1/days.</li>
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<li>All entries in this section are optional. Items offset by slashes (/) indicate allowable choices.</li>
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</ol>
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<p><b>Example:</b> </p><div class="fragment"><div class="line">[REACTIONS]</div>
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<div class="line">ORDER WALL 0 ;Wall reactions are zero-order</div>
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<div class="line">GLOBAL BULK -0.5 ;Global bulk decay coeff.</div>
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<div class="line">GLOBAL WALL -1.0 ;Global wall decay coeff.</div>
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<div class="line">WALL P220 -0.5 ;Pipe-specific wall coeffs.</div>
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<div class="line">WALL P244 -0.7</div>
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