Bernouilli’s equation

Bernouilli’s equation and the Venturi effect, and the continuity equation.
For more related figures, please have a look at the Fluid Dynamics category.

Edit and compile if you like:

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% Author: Izaak Neutelings (November 2020)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{tikz}
\usepackage[outline]{contour} % glow around text
\usetikzlibrary{patterns,decorations.pathmorphing}
\usetikzlibrary{decorations.markings}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{calc}
\tikzset{>=latex}
\contourlength{1.1pt}
\colorlet{mydarkblue}{blue!40!black}
\colorlet{myblue}{blue!30}
\colorlet{myred}{red!65!black}
\colorlet{vcol}{green!45!black}
\colorlet{watercol}{blue!80!cyan!10!white}
\colorlet{darkwatercol}{blue!80!cyan!80!black!30!white}
\tikzstyle{water}=[draw=mydarkblue,top color=watercol!90,bottom color=watercol!90!black,middle color=watercol!50,shading angle=0]
\tikzstyle{horizontal water}=[water,
  top color=watercol!90!black!90,bottom color=watercol!90!black!90,middle color=watercol!80,shading angle=0]
\tikzstyle{dark water}=[draw=blue!20!black,top color=darkwatercol,bottom color=darkwatercol!80!black,middle color=darkwatercol!40,shading angle=0]
\tikzstyle{vvec}=[->,very thick,vcol,line cap=round]
\tikzstyle{force}=[->,myred,very thick,line cap=round]
\tikzstyle{width}=[{Latex[length=3,width=3]}-{Latex[length=3,width=3]}]
\begin{document}
% CONTINUITY EQUATION
\begin{tikzpicture}
  \def\LL{2.0}         % length pipe left
  \def\LR{1.7}         % length pipe right
  \def\L{3.0*\LL}      % total length
  \def\l{\L-\LL-\LR}   % length between pipes
  \def\xL{0.24*\LL}    % position volume left
  \def\xR{\L-0.80*\LR} % position volume right
  \def\lL{0.7*\LR}     % length volume left
  \def\lR{\lL*\ry/\Ry} % length volume right
  \def\rx{0.08}        % small pipe horizontal radius left
  \def\ry{0.32}        % small pipe vertical radius left
 
 
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