1. Principle of differential pressure flow measurement
The principle of flowing a fluid through a constriction has been exploited since ancient times: time measurement using hourglasses and clepsydras, "billing" of water distributed by Roman aqueducts. However, the first scientific analysis of the differential pressure flowmeter dates back only to the early 17th century, when Castelli and Toricelli established that the flow in an orifice is the product of its cross-sectional area and the fluid's flow velocity, and that it varies as the square root of the pressure drop between upstream and downstream. A century later, Bernouilli formulated the theorem that rigorously described this phenomenon, while a few years earlier, Henri Pitot had invented a probe for measuring the flow velocity of a fluid. A little later, Venturi described the first instrument for measuring flow in a pipe. Finally, the...
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Principle of differential pressure flow measurement
Theoretical overview
Installation
Insert the CD ROM into the drive and double-click on "My Computer".
Double-click on the "Setup" icon.
The installation program generates a Program Files \TI\DepWin directory, but you can choose to create a different directory; an icon is also created, and placed on the "Desktop". If this is not the case, you can create a shortcut from Windows Explorer. Don't forget (if you...
Controls
Program commands can be accessed either from a menu bar or from a toolbar below. The list of commands and how to access them is :
The wording of the toolbar icons is that of the hint message that appears when the cursor is brought close to the corresponding icon.
1. File/New menu or "Reset" icon: variables on screen are completely erased. Use to perform a new calculation without...
Program description
Program
The program includes the following functional elements:
A practical note on checking integrated orifices
This note is intended for users who attempt to verify built-in orifices using the present program.
Integrated orifices are devices whose diameters are generally below the minimum limits set by ISO for pipe and primary element diameters, and which may deviate from the standard in many other respects: it is therefore by no means certain that their coefficients are...
Printing data
The DEPWIN program can print out the results displayed on the screen. To do this, simply activate the "Print" command (§ 2). A second screen appears, showing the results as they will be printed.
At the top of this screen is a toolbar:
the first three buttons from the left are zooms, allowing you to select the data display. They have no further effect...
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