Flow Meters And It’s Types

Flow of Fluids

 Industries me flow kai type ke hote hain,  jo ki hain:-

1)  Steady Flow

2) Unsteady Flow

3) Turbulent Flow

4) Helical Flow


1) Steady Flow:- Jab koi liquid flow ho raha ho aur agar us waqt us flow ho rahe liquid ki velocity same rehti hai to use steady flow kehte hain.

2)  Unsteady Flow:- Jab kisi flowing liquid ki velocity change hoti rehti hai waqt ke sath to use unsteady flow kehte hain.

3) Turbulent Flow:- Jab koi liquid uncontrolled way me flow ho raha ho to us flow ko turbulent flow kehte hain.

 4)Helical Flow:– Jab koi liquid rotational form me flow ho raha hota hai to use helical flow kehte hain.

Reynolds Number

Accurate flow measurement ke classification ke lie Reynolds Number bahut important reference hai. Osborn Reynolds ne iski invention 1980 me kiya tha. Agar flow hone wala liquid ka Reynolds number 2000 se kam hota hai to flow laminar ya steady hota hai lekin jab Reynolds number 2000 se zyada hota hai to flow turbulent hota hai.

Head Type Flow Meters

Head type flowmeters ko Differential flowmeters bhi kehte hain kyuki ye differential pressure par work karte hain.

Venturi Tube

Venturi Tube Bernouli’s theorem ke principle par work karte hain. Ye flow measurement ke primary element ki tarah work karte hain. Venturi ke main parts hote hain :-  Inlet section, converging cone, diverging cone, throat (jaisa ki diagram me hai). Venturi tube ka converging cone 19° to 23° hota hai  aur Diverging Cone 5° to 15° hota hai. Venturi tube ke dono side ek transmitter laga hota hai aur isi ki madad se ham inlet section aur outlet section ke beech ka differential pressure measure kar sakte hain.


Venturi tube ka yeh faida hai ki isme pressure loss bahut kam hote hain aur iski accuracy baaki differential flowmeters se achi hoti hai i.e. ±0.5%.

Orifice Plate

Yeh bhi ek primary flow measurement device hai jo ki industries me bahut commonly istemal ki jati hai iski low cost aur moderate ( average)  accuracy ki wajah se i.e. ±1.5% . Orifice plate bhi Bernouli’s Theorem par  work karti hai. Orifice Plates Phosphoric Bronze ya Standard Steel ki bani hoti hain. In plates centre   me ek sharp hole hota hai. Orifice plates ke ye faide hain ki inka installation kaafi aasan hota hai aur  repairing bhi easy hoti hai. Inke different sizes bhi easily available hote hain.

Orifice plates chaar types ki hoti hain:-

1)  Concentric  

2) Eccentric

3) Segmental

4) Quadrant Edge 

Pitot Tube

Pitot tube bhi differential pressure measure karne wala flow meter hai. Pitot tube ek primary flow measuring flowmeter hai. Pitot tube do concentric tubes se milkar banta hai. Ek tube ke andar doosra daala jata hai jaisa diagram me hai. Aur 4 se 8 holes in tubes ke side me kie jate hain.  Internal tube ka pressure outer se zyda hota hai. Resultant pressure dono tube ka measure kar lia jata hai manometer ke zarie. Inki cost venturi aur orifice dono se hi kam hoti hai aur accuracy bhi orifice se better hoti hai. Inka istemal keval steam flow me hi kiya ja sakta hai.

Flow Nozzles

Flow Nozzles ka agar diverging cone hata diya jae to ye venturi tube ki tarah dikhegi. Flow Nozzle bhi baaki head type flow meter ki tarah Bernouli’s theorem par work karta hai. Flow nozzles se flow measurement ke lie inko pipe me fit kar diya jata hai ya to flanges ki madad se ya to welding kar di jati hai jis pipe me flow measurement karna hota hai. Inki cost low hoti hai aur ye easily install bhi kiye ja sakte hain. Inka faida ye hai ki inme se solid particles bhi easily flow kar sakte hain. Aur inko liquids ke high pressure ko measure karne ke liye bhi istemal kiya ja sakta hai.

About Mohd Mustaqeem Siddiqui

You can contact me for any ITI related information and for any query on ITI Electronic or Instrument Mechanic. siddiquemustaqeem@gmail.com

View all posts by Mohd Mustaqeem Siddiqui →

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