Later, Moody 4 presented Colebrook’s results in a graphical format, which is called the Moody diagram 5, 6. Colebrook 3 realized experiments on several types of pipes and the results were correlated to the well-known Colebrook equation.
During the last several decades, several theoretical and experimental researches have been conducted to investigate the relationship between the friction factor and the Reynolds number. The friction factor is an important parameter in identifying the characteristics of flow and solute hydraulic transport. Groundwater flow and solute transport in fractured rock is of great interest in nuclear waste disposal, contaminant control, and oil recovery. In surcharged hydraulic systems, the head losses may become rather significant, and should not be neglected because could result in several problems, such as inappropriate drainage pipes, insufficient carrying capacities, blowout of manhole covers and the occurrence of floods, for example 2. The hydraulic drainage domestic and industrial networks have gradually become more complicated and diverse because of the cities’ rapid urbanization and expansion. They may be as uncomplicated as a single pipe conveying water from one reservoir to another or they may be as elaborate as an interconnected set of water distribution networks for a major metropolitan area 1. Pipeline systems range from the quite simple ones to large and quite complex ones. Keywords: head loss, hydraulic circuit, head loss coefficient, friction factor, Moody’s diagram. A good approximation between friction factor values obtained via experimental measurements and the Moody’s diagram was observed with mean absolute deviate of 0.0136. The Moody’s diagram application proved to be a quite appropriate tool for an approximate estimation of Darcy-Weisbach friction factor. Head loss experimental equations and local loss coefficients through BV-1 and 90E-8 were determined successfully. Experimental data generated head-loss curves and their well fitted to potential regressions, displaying correlation coefficients (R 2) of 0.9792, 0.9924, and 0.9820 for BV-1, 90E-8, and RP-11, respectively. The losses produced by the fluid viscous effect through the one used cast-iron rectilinear pipe (RP-11) and the localized losses generated by two flow appurtenances, one fully open ball valve (BV-1) and one module of forty-four 90º elbows (90E-8) were experimentally measured. This work presents an investigation about major and minor head losses in a hydraulic flow circuit, simulating the water transport in a drainage network at room temperature (298.15 K) under atmospheric pressure (101,325 Pa). In surcharged hydraulic systems, the head losses may become rather significant, and should not be neglected because could result in several problems. Domestic and industrial hydraulic drainage networks have gradually become more complicated because of the cities’ rapid expansion.
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