Multi_R_Designer Tutorial

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1) Open Case problem I.mr.

• Add the new specifications to the problem. Check the Liquid mass flow rate box, and select the corresponding Value field to enter the dialog window. Write 10 in the left box and 10 in the right box. Press OK, then Execute. Fourteen (14) data sets from Pommier, 1985 remain in the Search results table.

2) Select the Plot button . The Plot creator dialog window will appear.
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3) To specify the X-axis value, click on the knob corresponding to Operating conditions in the Horizontal axis panel. Highlight Gas superficial velocity.
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4) To specify the Y-axis value, click on the knob corresponding to Hydrodynamics in the Vertical axis panel. Click on the knob corresponding to Frictional pressure drop, and highlight Experimental.
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5) To specify the discriminate value, choose the Advanced tab. Click on the knob corresponding to Operating conditions, and select Pressure. Press OK.
 

6) To discriminate the diagram in terms of pressure, select the Discriminate series icon . In the dialog window, choose the Value discrimination option. The minimum and maximum values for the discriminate (pressure - 14 data sets) is presented (Min value: 10 bars; Max value: 90 bars). In order to discriminate the diagram into an infinite number of classes, enter a large number (i.e. 1000). Hopefully, the series will represent a single pressure instead of a range. Press OK. The following diagram is obtained.
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Advice: Do not divide the min-max range into a large number of classes for diagrams holding large number of data. Otherwise, the legend will contain an exhausting inventory.

CONCLUSION:  From the diagram point of view, it seems that high pressure operation increases the total pressure drop. However, one exception arises (blue point at X=0.01) which does not follow the general trend. It suggests that some experimental results from the integrated databank surely contain experimental errors and consequently, the data must be scrutinized objectively by the user.

Multi_R_Designer Tutorial