Major and minor head losses in a hydraulic flow circuit: experimental measurements and a Moody’s diagram application

Madeira, Aline Amaral

doi:10.26850/1678-4618eqj.v45.3.2020.p47-56

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…Therefore, this study indicates the gap of the recent studies. Although both head loss equations are important to adopt, some contemporary studies used one head loss equation [18,[20][21][22].…”

Section: Discussion Of the Results Of Calculation Of Head Losses And ...mentioning

confidence: 99%

Comparison between Hazen-Williams and Darcy-Weisbach equations to calculate head loss through conveyancing treated wastewater in Kerbala city, Iraq

Abdulameer

Dzhumagulova

Algretawee

et al. 2022

EEJET

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Reuse of wastewater has been widespread in this era to support the water sustainability process. Therefore, treated wastewater should be conveyed to suitable places and adopted for different uses. This study presents an empirical relationship between the Darcy-Weisbach and Hazen-Williams equations for four types of pipe material (ductile iron, GRP, concrete, and plastic) by using WaterCAD Version 8i. Two hydraulic models were developed to estimate the head loss in pipes by using different diameters: first, using pipe diameters from 800 mm to 1,200 mm for a flow rate of 1.16 m3/s, second, adopting pipe diameter from 1,600 mm to 2,000 mm for a flow rate of 4.63 m3/s. The study results are the head loss values obtained from the Darcy-Weisbach and Hazen-Williams equations, which were used to correlate them using IBM SPSS Statistics. The correlation coefficient between both equations turned out to be 0.991, 0.990, 0.990, and 0.990 for ductile iron, GRP, concrete, and plastic pipe materials. Additionally, the relationship between head loss and pipe diameter is negatively proportioned for both equations. Also, both head loss equation results are the same. The head loss values in the Darcy’s equation were higher for ductile iron and GRP materials, while being lower for concrete and plastic materials for both models. Selecting concrete or plastic pipes to convey treated wastewater is better than other pipe materials. Another conclusion is that the pipe diameter affects the head loss magnitude irrespective of the kind of equation whether Darcy-Weisbach or Hazen-William equation. Finally, this relationship is very useful for designers in converting the head loss values obtained using these equations.

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Section: Discussion Of the Results Of Calculation Of Head Losses And ...mentioning

confidence: 99%

Comparison between Hazen-Williams and Darcy-Weisbach equations to calculate head loss through conveyancing treated wastewater in Kerbala city, Iraq

Abdulameer

Dzhumagulova

Algretawee

et al. 2022

EEJET

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“…Pada sistem perpipaan, kerugian head akibat gesekan hf ditentukan berdasarkan jenis material pipa dan diplot pada diagam Moody pada gambar 2 [33] [34].…”

Section: Parameter-parameter Pompaunclassified

“…Gambar 2. Diamgram Moody The Moody diagram untuk factor koefesien gesek Darcy-Weisbach Sumber : Karen A. Flack, 2014 [33] [34] Penyelesaian semua kerugian-kerugian aliran dalam sistem akan menghasilkan koefesien kehilangan sistem K. Nilai kerugiankerugian gesek dapat diperoleh dengan menggunakan diagram Moody (Gambar 2) dan data komponen-komponan sistem lainnya. Selanjutnya karena debit alaran yang melewati sistem 𝑄 = 𝐴 • 𝑉, maka penyelesaian persamaan (7) menjadi :…”

Section: Parameter-parameter Pompaunclassified

EVALUASI KINERJA POMPA SENTRIFUGAL BERKAPASITAS 600 KL/Hr PADA SISTEM PEMOMPAAN MINYAK

Rumaherang,

Refwalu,

Tupamahu

et al. 2023

metiks

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Pompa sentrifugal adalah pompa dengan efisiensi tinggi, konstruksi sederhana dan banyak digunakan di dunia. Pompa sentrifugal modern saat ini beroperasi dengan efesiensi lebih dari 70% pada berbagai nilai putaran. Namun kesesuaian kerja dengan sistem pemompaan merupakan masalah penting dalam engineering dimana pompa harus dipilih sesuai kebutuhan system sehingga dapat bekerja dengan baik dan effisien. Pemilihan dan pengoperasian pompa untuk aplikasi didasarkan pada kurva karakteristik dan penggunaannya. Karakteristik pompa adalah prestasi pompa dalam bentuk grafik hubungan antara head (H), daya (P) dan efesiensi (η) terhadap debit (Q). Parameter-paramater ini menandai prestasi kerja dan biaya operasi pompa. Nilai performance optimal pemompaan merupakan masalah yang perlu diselesaikan dengan tujuan menentukan performance optimal. Analisis dilakukan secara teoritis dan membandingkanya dengan data lapangan yang tersedia. Secara teoritis popam hasil perhitungan bekerja pada kondisi optimum dimana parameter-parameter operasi berada poda nilai efesiensi pompa maksimum. .Head operasi optimal pompa berada pada nilai Q/Qd =1,28 atau pada nilai debit Q = 0,054 m3/s dan daya diberikan oleh pompa mencapai kondisi maksimum, dimana efesiensi maksimum adalah 70%. Karena hasil perhitungan head pompa menunjukan hasil yang hampir mendekati nilai head aktual hasil pengamatan, sehingga dapat disimpukan bahwa hasil perhitungan teoritis dapat digunakan sebagai pertimbangan dalam perencanaan dan oprasi system pemompaan

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“…A detailed graph for all types of flow, which includes laminar and turbulent regimes, is given by Moody in his diagram [23][24][25], as given in Figure 1. The turbulent flow of Moody's diagram as given in Figure 1 is based on the Colebrook equation (on the other hand, a similar diagram that follows Nikuradse's findings [13] is given by McGovern [26]).…”

Section: Physical Interpretationmentioning

confidence: 99%

Hydraulic Losses in Systems of Conduits with Flow from Laminar to Fully Turbulent: A New Symbolic Regression Formulation

Milosevic

Brkić

Praks

et al. 2022

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Separate flow friction formulations for laminar and turbulent regimes of flow through pipes are in common use in engineering practice. However, variation of different parameters in a system of conduits during conveying of fluids can cause changes in flow pattern from laminar to fully turbulent and vice versa. Because of that, it is useful to unify formulations for laminar and turbulent hydraulic regimes in one single coherent equation. In addition to a physical interpretation of hydraulic friction, this communication gives a short overview of already available Darcy’s flow friction formulations for both laminar and turbulent flow and additionally includes two simple completely new approximations based on symbolic regression.

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Major and minor head losses in a hydraulic flow circuit: experimental measurements and a Moody’s diagram application

Cited by 6 publications

References 10 publications

Comparison between Hazen-Williams and Darcy-Weisbach equations to calculate head loss through conveyancing treated wastewater in Kerbala city, Iraq

Comparison between Hazen-Williams and Darcy-Weisbach equations to calculate head loss through conveyancing treated wastewater in Kerbala city, Iraq

EVALUASI KINERJA POMPA SENTRIFUGAL BERKAPASITAS 600 KL/Hr PADA SISTEM PEMOMPAAN MINYAK

Hydraulic Losses in Systems of Conduits with Flow from Laminar to Fully Turbulent: A New Symbolic Regression Formulation

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