gallery: clean up dilute riser description

docs/webroot/gallery.html

@@ -68,17 +68,18 @@ END TEMPLATE-->
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-            Circulating fluidized beds (CFBs) span a wide range of operating ranges throughout 
-            their subsystems. The riser section is typically characterized by dilute transport. 
-            Here, a 1.8 m section (~9M particles) of a pilot-scale CFB riser at 
-            <a href="https://psri.org">PSRI</a> is modeled, just 1/10th of the physical 
-            system's length. As high speed (15 m/s) gas flow drives the verically, denser than 
-            average (1%) regions can form at (or migrate to) the wall and actually fall against 
-            the mean flow. This phenomena can be observed on the right in the video while a 
-            streamer climbes slowly on the left. We note that the domain is too small as the 
-            streamer has interacted with its periodic image. Future work will simulate the full 
-            18 m lenght of the riser. 
-            Simulated by MFiX-Exa develop (git hash ef171c9d) using 24 GPUs on NETL's Joule2 HPC.
+            Circulating fluidized beds (CFBs) span a wide range of operating conditions 
+            throughout their subsystems. The riser section is typically characterized by 
+            dilute transport. Here, a 1.8 m section (~9M particles) of a pilot-scale CFB 
+            riser at <a href="https://psri.org">PSRI</a> is modeled, just 1/10th of the 
+            physical system's length. As high speed (15 m/s) gas flow drives the 
+            650 micron HDPE particles vertically, denser than average (1%) regions can 
+            form at (or migrate to) the wall and fall against the mean flow. 
+            This phenomena can be observed on the right in the video while a streamer 
+            climbs slowly on the left. We note that the domain is too short, as the streamer 
+            has interacted with its periodic image. Future work will simulate the full 18 m 
+            length of the riser.
+            Simulation by MFiX-Exa develop (git hash ef171c9d) using 24 GPUs on NETL's Joule2 HPC.
             The animation rendered with <a href="https://www.blender.org">Blender</a>.
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