From 3a25b5ad548e6d95b22570995a80e165248b1e4d Mon Sep 17 00:00:00 2001
From: Nao Pross <naopross@thearcway.org>
Date: Wed, 29 Apr 2020 20:56:35 +0200
Subject: Update figures and continue thermodynamics

---
 fig/prandtl-boundary.tex | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'fig/prandtl-boundary.tex')

diff --git a/fig/prandtl-boundary.tex b/fig/prandtl-boundary.tex
index 90e3657..2258b20 100644
--- a/fig/prandtl-boundary.tex
+++ b/fig/prandtl-boundary.tex
@@ -5,7 +5,8 @@
     \pgfmathsetmacro{\vpos}{2}
     
     % block
-    \draw[fill] (\lpos,0) rectangle ++(\l,-.2);
+    %% needs \usetikzlibrary{patterns}
+    \draw[pattern=north west lines, thick] (\lpos,0) rectangle ++(\l,-.2);
     \draw[<->]  (\lpos,-.4) -- node[midway, below] {\(\ell\)} ++(\l,0);
     
     % boundary line and area
@@ -20,7 +21,7 @@
     
     % height
     \pgfmathsetmacro{\h}{\k*sqrt(\l)}
-    \draw[<->] (\lpos,0) ++(\l,0) -- node[midway, right] {\(h\)} ++(0,\h);
+    \draw[<->] (\lpos,0) ++(\l,0) -- node[midway, right] {\(D_\text{l}\)} ++(0,\h);
         
     % velocity vectors
     \draw[dashed]    (\vpos,0) -- ++(0,2);
-- 
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