refactor diffusion, add solutions with convection BC

docs/reference/transport/diffusion/_SUMMARY.md

@@ -1,6 +1,9 @@
+* [](index.md)
 * [diffusivity_composite](diffusivity_composite.md)
-* [profile_semiinf](profile_semiinf.md)
-* [profile_sheet](profile_sheet.md)
-* [profile_sphere](profile_sphere.md)
-* [uptake_sheet](uptake_sheet.md)
-* [uptake_sphere](uptake_sphere.md)
+* [profile_constc_semiinf](profile_constc_semiinf.md)
+* [profile_constc_sheet](profile_constc_sheet.md)
+* [profile_constc_sphere](profile_constc_sphere.md)
+* [uptake_constc_sheet](uptake_constc_sheet.md)
+* [uptake_constc_sphere](uptake_constc_sphere.md)
+* [uptake_convection_sheet](uptake_convection_sheet.md)
+* [uptake_convection_sphere](uptake_convection_sphere.md)

docs/reference/transport/diffusion/index.md

@@ -0,0 +1,7 @@
+# Diffusion (polykin.transport.diffusion)
+
+## Overview
+
+This module provides analytical solutions for transient diffusion in plane sheets and spheres
+under various boundary conditions. These equations are equally applicable to heat conduction
+due to the identical mathematical framework.

docs/reference/transport/diffusion/profile_semiinf.md → docs/reference/transport/diffusion/profile_constc_semiinf.md

@@ -3,4 +3,4 @@
 ::: polykin.transport.diffusion
     options:
         members:
-            - profile_semiinf
+            - profile_constc_semiinf

docs/reference/transport/diffusion/profile_constc_sheet.md

@@ -0,0 +1,12 @@
+# polykin.transport.diffusion
+
+::: polykin.transport.diffusion
+    options:
+        members:
+            - profile_constc_sheet
+
+### Graphical Illustration
+
+The numbers in the legend are values of $Fo = D t / a^2$.
+
+![profile_constc_sheet](profile_constc_sheet.svg)

docs/reference/transport/diffusion/profile_sheet.md → docs/reference/transport/diffusion/profile_constc_sphere.md

@@ -3,10 +3,10 @@
 ::: polykin.transport.diffusion
     options:
         members:
-            - profile_sheet
+            - profile_constc_sphere
 
 ### Graphical Illustration
 
 The numbers in the legend are values of $D t / a^2$.
 
-![profile_sheet](profile_sheet.svg)
+![profile_constc_sphere](profile_constc_sphere.svg)

docs/reference/transport/diffusion/uptake_sphere.md → docs/reference/transport/diffusion/uptake_constc_sheet.md

@@ -3,8 +3,8 @@
 ::: polykin.transport.diffusion
     options:
         members:
-            - uptake_sphere
+            - uptake_constc_sheet
 
 ### Graphical Illustration
 
-![uptake_sphere](uptake_sphere.svg)
+![uptake_constc_sheet](uptake_constc_sheet.svg)