2014 **Abstract:** When there was a lack of computing power, several approximate formulas (Weymouth, Panhandle, AGA, etc.) were developed to obtain pressure drop in gas pipelines, which are in many instances still being used. As it is well-known, they can be sometimes grossly inaccurate, necessitating the addition of an arbitrary parameter ("pipe efficiency") for each case. The right answer, now that we have computers and numerical integration methods, is to perform integration of the mechanical energy balance at least, if not b…

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“…(11)-up, and von Karman-Prandtl form or logarithmic relationships; Eq. (11)-down: (11) Some possible values for coeficient A and exponent B for the Blasius form or power law relationships [17,26,31]; Eq. (11)-up, is given in Table 1: [32], Eq.…”

confidence: 99%

“…(11)-up, and von Karman-Prandtl form or logarithmic relationships; Eq. (11)-down: (11) Some possible values for coeficient A and exponent B for the Blasius form or power law relationships [17,26,31]; Eq. (11)-up, is given in Table 1: [32], Eq.…”

confidence: 99%

“…Turbulent flow is a phenomena that still causes a stir among experts [29,30]. Thus, the formula shown here is suitable for the flow of Newtonian fluids, whereas some restrictions are applied for gases [31].…”

confidence: 99%

“…Some possible values for coefficient A and exponent B in Blasius-form power-law relationships [17,26,31], as seen in Equation 11, are given in Table 1 below:…”

confidence: 99%

“…Bogataj and Bagajewicz [12] presented a mixed integer nonlinear programming (MINLP) model to simultaneously synthesize the water allocation and heat exchanger networks. Dong et al [13] proposed a modified state-space superstructure [14,15] to formulate MINLP models for simultaneous optimization of water and heat networks. Feng et al [16] analyzed the reasons why water networks with the same water target had different energy performance and presented a mathematical model for the design of water networks featuring good energy performance.…”

confidence: 99%