How can I generate the above image using TikZ. The oval inside tube represents water and arrows indicates the dipole orientation of water.What I was able to get so far is pasted below.
\documentclass{article}\usepackage{tikz}\usepackage{tikz-3dplot}%%%<\usepackage{verbatim}\usepackage[active,tightpage]{preview}\PreviewEnvironment{tikzpicture}\setlength\PreviewBorder{5pt}%%%%>\begin{document}\tdplotsetmaincoords{30}{10}\tikzset{every circle/.append style={x=1cm, y=1cm}}\begin{tikzpicture}[tdplot_main_coords, rotate=90]% --- Independent parameters ---\pgfmathtruncatemacro\tA{3600} % 10 turns 360 degree x 10=3600\def\zA{1} % A begin point, define the length of cylinder \pgfmathtruncatemacro\tB{30} % tB end of turn \def\zB{5} % B end point\pgfmathtruncatemacro\NbPt{130} % number of circles for drawing the helix portion 13 times 10 turns =130\def\rhelixdots{0.14} % radius of circles forming helix % --- Draw helix ---\pgfmathsetmacro\tone{\tA}\pgfmathsetmacro\tlast{\tB}\pgfmathsetmacro\ttwo{\tone+(\tlast-\tone)/(\NbPt-1)}\pgfmathsetmacro\p{360*(\zB-\zA)/(\tB-\tA)}\foreach \t in {\tone,\ttwo,...,\tlast}{%\pgfmathtruncatemacro{\shadingcolor}{40*sin(\t+180)+80}\shade[ball color=blue!\shadingcolor] ({0.7*cos(\t)},{0.7*sin(\t)},{\p*(\t-\tA)/360+\zA}) circle[radius=\rhelixdots];\shade[ball color=red!\shadingcolor] ({0.7*cos(\t)},{0.7*sin(\t)},{\p*(\t-\tA)/360+\zA+0.2}) circle[radius=\rhelixdots];}\end{tikzpicture}\end{document}
Looking for help, please have a look as well to this post Changing the view angle distort 3d tube image
