Validation of a Discrete Model for Flow Distribution in Dividing-Flow Manifolds: Numerical and Experimental Studies

Tomor, András; Kristóf, Gergely

doi:10.3311/ppme.8518

Cited by 14 publications

(4 citation statements)

References 25 publications

(42 reference statements)

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“…Kolektörler, büyük bir sıvı akışının birçok paralel akışa bölünmesinde, akışların ayrı ayrı kullanılmasında veya ayrı şekilde gelen akışların bir akışta toplanması gerektiği durumlarda kullanılan önemli bir parçadır. Kolektör sistemleriyle elde edilen akış türleri pek çok mühendislik alanında kullanıldığı gibi, su ve atık su arıtma sistemlerinde de kullanılır [5]. Kolektörler bir akışı birleştirme, bölme, tersine çevirme ya da paralel bir akış elde etmek amacıyla kullanılabilir.…”

Section: Pompaunclassified

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Investigation of Effects On The Pumps When Using Together Gravity Mains And Force Mains In Drinking Water Transmission

KOCA,

ATMACA

2023

International Journal of Advances in Engineering and Pure Sciences

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Günümüzde 1.5 milyon m3 kapasitesiyle Ömerli İçme Suyu Arıtma Tesisi İstanbul'un içme suyu ihtiyacının %48’ini karşılamaktadır. Tesisteki pompaların durumu ve boru hatlarındaki debi ölçümleri uzaktan kontrol ve kumanda sistemleriyle (SCADA) anlık olarak izlenmektedir. Ancak boru içindeki akışlar, kolektör hatları ya da ölçümü yapılmayan noktalardaki suyun hareketi takip edilememektedir. Bu çalışmada, pompalı hatlarla cazibeli hatların birlikte kullanılmasının, pompalar üzerindeki etkileri deneysel ve sayısal analizlerle incelenmiştir. Deneysel çalışmada ilk önce yalnızca pompalar rutin çalışma şeklinde çalıştırılmış ve debileri ölçülmüştür. Daha sonra cazibeli hat devreye alınmış ve yüksek basınçla gelen akışın pompalar üzerindeki etkileri gösterilmiştir. Cazibeli hattın pompalar üzerindeki etkileri sayısal olarak araştırılmıştır. Bunun için Ansys Fluent 2022 R1 yazılımı kullanılmıştır. Deneysel çalışma sonucunda pompalı hatlarla nispeten daha yüksek basınçlı hatlar birlikte çalıştırıldığında, pompalarda %48’lere varan debi kaybı olduğu tespit edilmiştir. Sayısal hesaplamalar sonucunda ise pompa hattına giren yüksek basınçlı akışların, pompaların basma yönlerinde engel oluşturarak iç basıncın artmasına ve pompa debisinin azalmasına sebep olduğu anlaşılmıştır.

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Section: Pompaunclassified

“…Bununla birlikte, bu sonuçların güvenilirliği genellikle sorgulanabilir. Ayrıca, analizi yapılan geometrileri optimize etmek için, özellikle 3 boyutlu karmaşık yapılarda yüksek hesaplama maliyetlerine ihtiyaç duyar [5] [8]. Analiz sonuçlarının deneysel çalışmalarla desteklenmesi gerekmektedir.…”

Section: Pompaunclassified

Investigation of Effects On The Pumps When Using Together Gravity Mains And Force Mains In Drinking Water Transmission

KOCA,

ATMACA

2023

International Journal of Advances in Engineering and Pure Sciences

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“…The literature on microscale devices (both experimental and CFD studies) has been discussed in detail in Section 2.1. Several significant strategies to address the issue of maldistribution through numerical/analytical techniques for different geometrical configurations include 1) analytical/discrete models preferred as compared to CFD by researchers (Devia et al, 2015;Wang and Wang, 2015;Tomor and Kristóf, 2016) for U-and Z-type manifolds, 2) incorporation of internals like distributors for manifolds with central inlets and outlets (Zhao et al, 2017;Gilmore et al, 2021), 3a) optimization of geometric parameters like (b) inlet diameter to individual tube ratios (Hadad et al, 2020); shape of the inlet (like triangular inlets) (Zoljalali and Omidbakhsh Amiri, 2020); and (c) other geometrical parameters (Zhuang et al, 2020;Ghasabehi et al, 2021), 4) header designs with multistage topologies (Ju et al, 2018;Zeng et al, 2018), and 5) number of flow inlets and outlets (Lim et al, 2018). Experimental works to study maldistribution include the following: 1) optimizing outlet diameters for bifurcation manifolds (Zhuang et al, 2019); 2) geometry optimization by measuring current as a function of flow (Ji et al, 2019).…”

Section: Literature Review Summarymentioning

confidence: 99%

Computational fluid dynamics simulations to improve performance characteristics of a manifold having a central inlet and outlet

Ganguli

Pandit²

2022

Front. Energy Res.

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In the present work, performance/flow characteristics (namely, the effect of operating parameters like pressure on flow patterns, pressure drop, and the extent of flow uniformity) and transport phenomena of a manifold (header tube assembly) having an inlet and outlet at the center are carried out on a macroscale geometry using CFD simulations. In this study, an existing design available in the published literature (with high flow non-uniformity) was considered and an optimized design (with minimum flow non-uniformity) was developed. The optimization is performed by incorporating a perforated plate (distributor) inside the top header of the manifold. First, CFD simulations for different configurations of the existing design with the perforated plate have been performed for a pressure of 10 bar with steam as a working fluid, and an optimized configuration having a minimum flow non-uniformity of less than 3% is obtained. CFD simulations for both the existing design and optimized design are then performed for a pressure range (10 ≤ p ≤ 70 bar) and the corresponding Reynolds number (Re) range (2.82E+05 ≤ Re ≤ 2.82E+06) with steam as the working fluid. The extent of non-uniformity (ENU) and pressure drop for the existing design (without a distributor) and optimized design (with a distributor) have been analyzed and compared. The optimized design gives the near uniform flow (∼1–4%) for all pressures and Reynolds numbers considered. An empirical correlation relating the friction factor (as per the Chilton–Colburn analogy) and Re has been developed for both designs (with and without a distributor). The predicted friction factors are compared with the present CFD predictions, and experimental data of the shell and tube heat exchanger are available in the published literature. A good agreement within a 10–15% deviation has been observed. Based on the Chilton–Colburn analogy, a correlation for the Nusselt number is obtained from the friction factor correlations for both with and without distributor cases. The correlations for friction factors were found to be valid under any operating conditions for a pressure drop range within 0.05 < ∆p < 1.8 bar irrespective of the design of the distributor, assuming that the manifold is able to withstand the pressure drops in the given range.

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“…These factors are configuration dependent and are unique to each type of manifold system. 21 for finding solutions to manifold problems. In the available literature, the complexity of flow distribution through manifolds is reduced by the following assumptions: (i) all the channels are uniformly spaced (ii) flow across all the channels is the same and (iii) all channels have the same cross-sectional area.…”

Section: Introductionmentioning

confidence: 99%

A Design of Experiments Approach Towards Desired Flow Distribution Through Manifolds in Electronics Cooling

et al. 2022

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For rack-mounted electronics, flow distribution is desired as per the heat load characteristics. In the literature, attainment of flow uniformity through manifolds is highlighted and widely discussed as it has more applications. To attain desired flow distribution, the complexity of the problem increases. In the present paper, the Design of Experiments (DOE) along with response surface optimization is used to arrive at desired flow, which includes uniform flow also. A three-dimension, 10-channel Z-type manifold is considered for the study. This model is taken from experimentally verified and published data for which desired flow patterns are achieved. Flow requirement through each channel is set as a parameter for optimization and by the defined sample set under DOE, uniform flow and pattern flow are achieved by introducing suitable orifices. Multi-Objective Genetic Algorithm (MOGA) is used for obtaining orifice diameters. A good agreement is observed between the attained flow patterns and desired patterns. This approach is simple and can be implemented for industrial applications.

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Validation of a Discrete Model for Flow Distribution in Dividing-Flow Manifolds: Numerical and Experimental Studies

Abstract: Abstract

Cited by 14 publications

References 25 publications

Investigation of Effects On The Pumps When Using Together Gravity Mains And Force Mains In Drinking Water Transmission

Investigation of Effects On The Pumps When Using Together Gravity Mains And Force Mains In Drinking Water Transmission

Computational fluid dynamics simulations to improve performance characteristics of a manifold having a central inlet and outlet

A Design of Experiments Approach Towards Desired Flow Distribution Through Manifolds in Electronics Cooling

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