Synthèse des formules du calcul des pertes de charges et analyse de l'incertitude sur le choix de la rugosité

Abstract

The displacement of a fluid in a pipe implies the existence of a motive power which is at the origin of the movement. This energy is the result of pressure upstream of the network which is commonly called head by analogy to the height of a column of fluid equal to the difference of level. The pressure loss study is done with various ancient and modern forms and with respect to the roughness of the pipe used to calculate.The comparison between the formula and the correlations identified a specific formula properties that of Darcy-Weisbach as the best or most suitable for the calculation. The influence of temperature on the charges of losses requires us to take them into account in the design. The increase of roughness in the design will ensure the proper functioning of the system for quite a long time.