how we can design a simple total head tube ??
Your supposition isn't splendid for a standard venturi. If the venturi is pushed (enable's say it relatively is a steam jet) then the rationalization fluid components ability that will boost the entire head on the region you point out.
A tube with an open ends and connected straight (at right angle) into the side of a pressure container like a pipe or a vessel is called a piezometer. Fluid will rise in the tube equivalent to the static pressure in the container. In a pipe the fluid will probably also be moving and so will have some dynamic energy. If the tube tip has been bent 90 deg. and inserted ( preferably to the center) so that active end is facing upstream, the impact of the moving fluid will convert to additional height of fluid in the tube so that the total head will be the sum of the static equivalent plus the velocity equivalent in feet or meters. That tube is sometimes called an impact tube. The best arrangement is to close the active end of the tube and drill a hole at 90 deg near the end. This allows for the straight tube to be more easily inserted through a small round opening with a sealing gland to stop leakage. This short part can be metal and a clear plastic or glass tube extension fitted to it. A Pitot tube is a combination of the two types of tube and is commonly utilized to measure velocity by subtracting the two heads. It is used in any fluid, water or air, open or contained. However, the Pitot like most other pressure devices usually employs a gage rather than open tubes. The open tubes will limit the amount of pressure to be measured because for each pound of measured pressure (psig), water will rise 2.31 feet.
