4.2.2 Displaying a Number Density Function

You can display the number density function for the population balance model using the Number Density Function dialog box (Figure  4.2.2).

Report $\rightarrow$ Population Balance $\rightarrow$ Number Density...

Figure 4.2.2: The Number Density Function Dialog Box

The steps for displaying the number density function are as follows:

1.   Specify the Report Type as either a Surface Average or a Volume Average.

2.   Under Plot Type, specify how you would like to display the number density function data.

Histogram   displays a histogram of the discrete number density ( $N_i$). The number of divisions in the histogram is equal to the number of bins specified in the Population Balance Model dialog box. This option is available only with the discrete method.

Curve   displays a smooth curve of the number density function.

3.   In the Fields list, select the data to be plotted.

Discrete Number Density   ( $N_i$) is the number of particles per unit volume of physical space in the $i$th size bin plotted against particle diameter size $i$. This option is available only with the discrete

method.

Length Number Density Function   ( $n(L)$) is the number of particles per unit volume of physical space per unit particle length plotted against particle diameter.

Volume Number Density Function   ( $n(V)$) is the number of particles per unit volume of physical space per unit particle volume plotted against particle volume.

4.   Choose the cell zones on which to plot the number density function data in the Cell Zones list.

5.   Click Plot... to display the data.

6.   (optional) Click Print to display the number density function data in the console window.

7.   Click Write to save the number density function data to a file. The Select File dialog box will open, where you can specify a name and save a file containing the plot data. The file extension should be .pbd.