how can I plot fluid through the cylinders

%t = 0:pi/18:2*pi;  y=0:.01:3;x=0:.01:3;
t = 0:pi/20:2*pi;  y=0:.01:5;x=0:.01:5;
%[X,Y,Z] = cylinder(.8*(1+.06*sin(5*t)));
[X,Y,Z] = cylinder(.8*(1+.06*sin(5*t)));
surfl(X,Z,Y)
hold on
%[X,Y,Z] = cylinder(1.8*(1+.06*sin(5*t)));
[X,Y,Z] = cylinder(1.8*(1+.06*sin(5*t)));
surfl(X,Z,Y)
%title('$\lambda=5,\epsilon=0.06$','Interpreter','latex','FontSize',11,'FontName','TiemsNewRoman','FontWeight','Normal');
shading interp
colormap(gray);
axis square
axis off