Abstract
For the dimensioning of hydraulic systems used for water distribution, it is necessary to quantify the continuous head loss along the pipes. For this, one of the variables that influences this process is the surface roughness of these pipes, which, many times, does not have updated information and exact values ??for a correct dimensioning of the systems. An alternative to this is the measurement of these roughnesses through specialized instruments that determine various parameters of amplitude of irregularities. This work aims to analyze and compare the internal surface roughness, represented by the Ra parameter, through two measuring equipment (bench rugosimeter and portable rugosimeter), measured in PVC tubes used for water distribution, in addition to verifying the possibility of use of portable and easy-to-handle equipment. It was verified that the portable rugosimeter proved to be satisfactory for determinations of the roughness of the inner surface of PVC pipes, with smaller deviations than the bench rugosimeter, regarding the calculation off, and, in addition, it will serve the manufacturers to supply information related to the quality of the internal surface of your pipes.
Highlights
The Colebrook-White equation has been widely used to determine the head loss coefficient (Brkić & Ćojbašić, 2016; Zeghadnia et al, 2019) present in the Darcy-Weisbach formulation to measure the head loss of pipes
This work aims to analyze and compare the internal surface roughness, represented by the Ra parameter, through two measuring equipment, measured in polyvinyl chloride (PVC) tubes used for water distribution, in addition to verifying the possibility of use of portable and easy-to-handle equipment
It was verified that the portable rugosimeter proved to be satisfactory for determinations of the roughness of the inner surface of PVC pipes, with smaller deviations than the bench rugosimeter, regarding the calculation off, and, in addition, it will serve the manufacturers to supply information related to the quality of the internal surface of your pipes
Summary
The Colebrook-White equation has been widely used to determine the head loss coefficient (Brkić & Ćojbašić, 2016; Zeghadnia et al, 2019) present in the Darcy-Weisbach formulation to measure the head loss of pipes. Several researchers have endeavored to find explicit equations that could be used as alternatives to the ColebrookWhite equation (Brkić & Praks, 2019; Minhoni et al, 2020; Niazkar, 2020), and, according to Bardestani et al (2017), more complex relationships estimate the pressure drop coefficient more accurately. In an analysis of explicit equations of the pressure drop coefficient, and, comparison with the Colebrook-White formulation, Pimenta et al (2018) determined that the most accurate was the expression of Offor & Alabi (2016), valid for the range of Reynolds number of 4 × 103 ≤ Re ≤ 108 and relative roughness of 0 ≤ Ɛ/D ≤ 5×10-2. According to Rocha et al (2017), if these inequalities are high and at high frequency, the surface is considered rough, and if the divergences are smaller, the surface is considered smooth
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