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Journal articles on the topic 'Buckingham π theorem'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

García-Barrachina, Luis, та Antonio J. Gámez. "Dimensional Analysis of Superplastic Processes with the Buckingham Π Theorem". Metals 10, № 12 (2020): 1575. http://dx.doi.org/10.3390/met10121575.

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This work applies the Buckingham Π theorem from dimensional analysis on superplastic processes in order to obtain laws of behaviour in a simple way. For this reason, a mathematical background is developed. The particular behaviour of superplastic materials makes it necessary to adapt the way in which these are treated, modelling them by a viscosity function of the strain-rate. Then, dimensional analysis is applied on a set of free-inflation tests in order to obtain a formula that defines the forming time as single function of geometric and material variables. Dimensional analysis allows us to

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Münker, Tobias, Denis Anders та Kerstin Weinberg. "Application of Buckingham Π -theorem to asymmetric plate rolling processes". PAMM 12, № 1 (2012): 647–48. http://dx.doi.org/10.1002/pamm.201210312.

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3

Mohseni, M. S., B. Miripour-Fard, and A. Zajkani. "Experimental Study of Pumping Performance of Rotating Helical Pump as a Gas—Liquid Transporter." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 224, no. 11 (2010): 2418–22. http://dx.doi.org/10.1243/09544062jmes1868.

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A rotating helical pump is introduced in this article. This pump can transport gas—liquid two-phase flow. A prototype of the pump was manufactured, and its operational performance was determined experimentally. The influence of the pump geometric parameters on its performance was investigated. Dimensionless parameters were derived from the Buckingham π-theorem to find the effect of a wide range of parameters. Results provide some useful information about the performance of the rotating helical pump.

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4

Dapelo, Davide, Robin Trunk, Mathias J. Krause, Nigel Cassidy та John Bridgeman. "The application of Buckingham π theorem to Lattice-Boltzmann modelling of sewage sludge digestion". Computers & Fluids 209 (вересень 2020): 104632. http://dx.doi.org/10.1016/j.compfluid.2020.104632.

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Ciulla, Giuseppina, Antonino D’Amico та Valerio Lo Brano. "Evaluation of building heating loads with dimensional analysis: Application of the Buckingham π theorem". Energy and Buildings 154 (листопад 2017): 479–90. http://dx.doi.org/10.1016/j.enbuild.2017.08.043.

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6

Korczewski, Zbigniew, and Konrad Marszałkowski. "Energy Analysis of the Propulsion Shaft Fatigue Process in a Rotating Mechanical System Part III Dimensional Analysis." Polish Maritime Research 28, no. 2 (2021): 72–77. http://dx.doi.org/10.2478/pomr-2021-0023.

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Abstract This article presents the third and last part of the problem of diagnosing the fatigue of marine propulsion shafts in terms of energy with the use of the action function, undertaken by the authors. Even the most perfect physical models of real objects, observed under laboratory conditions and developed based on the results of their research, cannot be useful in diagnostics without properly transferring the obtained results to the scale of the real object. This paper presents the method of using dimensional analyses and the Buckingham theorem (the so-called π theorem) to determine the

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Russo, Luigi, Marco Sorrentino, Pierpaolo Polverino та Cesare Pianese. "Application of Buckingham π theorem for scaling-up oriented fast modelling of Proton Exchange Membrane Fuel Cell impedance". Journal of Power Sources 353 (червень 2017): 277–86. http://dx.doi.org/10.1016/j.jpowsour.2017.03.116.

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8

Ghaemi, Ahad. "Mass transfer and thermodynamic modeling of carbon dioxide absorption into MEA aqueous solution." Polish Journal of Chemical Technology 19, no. 3 (2017): 75–82. http://dx.doi.org/10.1515/pjct-2017-0052.

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Abstract In this research, thermodynamic and absorption rate of carbon dioxide in monoethanolamine (MEA) solution was investigated. A correlation based on both liquid and a gas phase variable for carbon dioxide absorption rate was presented using the π-Buckingham theorem. The correlation was constructed based on dimensionless numbers, including carbon dioxide loading, carbon dioxide partial pressure, film parameter and the ratio of liquid phase film thickness and gas phase film thickness. The film parameter is used to apply the effect of chemical reactions on absorption rate. A thermodynamic m

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9

Schricker, Klaus, Mohammad Alhomsi, and Jean Pierre Bergmann. "Thermal Efficiency in Laser-Assisted Joining of Polymer–Metal Composites." Materials 13, no. 21 (2020): 4875. http://dx.doi.org/10.3390/ma13214875.

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Heat conduction joining is mainly used in laser-based joining of metals with polymers but results in a large amount of dissipated heat. The consideration of thermal efficiency allows the determination of power actually used for creating the joint, which is highly relevant for technical and economic reasons, e.g., for calculating the carbon footprint. In order to describe the thermal efficiency universally, process parameters (focal diameter, joining speed, energy per unit length), metallic materials (AA 6082, AISI 304), geometric parameters (overlap width, material thickness) and various polym

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10

Rogkas, Nikolaos, Christos Vakouftsis, Georgios Vasileiou, Christos Manopoulos, and Vasilios Spitas. "Nondimensional Characterization of the Operational Envelope of a Wet Friction Clutch." Computation 8, no. 1 (2020): 21. http://dx.doi.org/10.3390/computation8010021.

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In recent years, multidisc wet friction clutches are used in demanding powertrains of automatic and dual clutch transmissions targeting high efficiency and smoothness during gearshift. However, the developed flow pattern between the clutch discs is significantly complex and the Computational Fluid Dynamics (CFD) methods employed are quite demanding in terms of computational cost. To deal with this issue semi-analytical solutions were derived, which are limited, however, to specific problems, in order to obtain handy expressions, while also providing insight to the wet clutch physics. Neverthel

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Sutrisno, Sigit Iswahyudi, and Setyawan Wibowo. "Dimensional Analysis of Power Prediction of a Real-Scale Wind Turbine Based on Wind-Tunnel Torque Measurement of Small-Scaled Models." Energies 11, no. 9 (2018): 2374. http://dx.doi.org/10.3390/en11092374.

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A preliminary study of a horizontal-axis wind turbine (HAWT) design is carried out using a wind tunnel to obtain its aerodynamic characteristics. Utilization of data from the study to develop large-scale wind turbines requires further study. This paper aims to discuss the use of wind turbine data obtained the wind-tunnel measurements to estimate the characteristics of wind turbines that have field size. One should measure the torque of two small-scale turbines inside the wind tunnel. The first small-scale turbine has a radius of 0.14 m, and the radius of the second small turbine is 0.19 m. Tor

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Gołąbek, Andrzej, Wiesław Szott, Piotr Łętkowski, and Jerzy Stopa. "Similitude Analysis of Experiment and Modelling of Immiscible Displacement Effects with Scaling and Dimensional Approach." Energies 13, no. 19 (2020): 5224. http://dx.doi.org/10.3390/en13195224.

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This paper presents the use of scaling and dimensional analysis to assess the viability of conventional modelling of immiscible displacement occurring when water is injected into the oil-saturated, porous rock—a conventional secondary oil-recovery method. A brief description of the laboratory tests of oil displacement with water performed on long core sets taken from wells operating on a Polish oil reservoir was presented. A dimensionless product generator based on dimensional analysis and Buckingham Π theorem was used to generate all possible combinatorial sets of dimensionless products for p

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Polsinelli, James, and M. Levent Kavvas. "A comparison of the modern Lie scaling method to classical scaling techniques." Hydrology and Earth System Sciences 20, no. 7 (2016): 2669–78. http://dx.doi.org/10.5194/hess-20-2669-2016.

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Abstract. In the past 2 decades a new modern scaling technique has emerged from the highly developed theory on the Lie group of transformations. This new method has been applied by engineers to several problems in hydrology and hydraulics, including but not limited to overland flow, groundwater dynamics, sediment transport, and open channel hydraulics. This study attempts to clarify the relationship this new technology has with the classical scaling method based on dimensional analysis, non-dimensionalization, and the Vaschy–Buckingham-Π theorem. Key points of the Lie group theory, and the app

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Polsinelli, J., and M. L. Kavvas. "A comparison of the modern Lie scaling method to classical scaling techniques." Hydrology and Earth System Sciences Discussions 12, no. 10 (2015): 10197–219. http://dx.doi.org/10.5194/hessd-12-10197-2015.

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Abstract. In the past two decades a new modern scaling technique has emerged from the highly developed theory on the Lie group of transformations. This new method has been applied by engineers to several problems in hydrology and hydraulics including but not limited to groundwater dynamics, sediment transport, and open channel hydraulics. This study attempts to clarify the relationship this new technology has with the classical scaling method based on dimensional analysis, non dimensionalization, and the Buckingham Π theorem. Key points of the Lie group theory, and the application of the Lie s

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15

Baakeem, Saleh S., Saleh A. Bawazeer, and Abdulmajeed A. Mohamad. "A Novel Approach of Unit Conversion in the Lattice Boltzmann Method." Applied Sciences 11, no. 14 (2021): 6386. http://dx.doi.org/10.3390/app11146386.

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The lattice Boltzmann method (LBM) is an alternative method to the conventional computational fluid dynamic (CFD) methods. It gained popularity due to its simplicity in coding and dealing with a complex fluid flow such as the multiphase flow. The method is based on the kinetic theory, which is mesoscopic scale. Hence, applying the LBM method for macroscopic problems requires a proper conversion from the physical scale (conventional units) to the mesoscopic scale (lattice units) and vice versa. The Buckingham π theorem and the principle of corresponding states are the popular methods used for d

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16

Cho, Uichung, Alan J. Dutson, Kristin L. Wood, and Richard H. Crawford. "An Advanced Method to Correlate Scale Models With Distorted Configurations." Journal of Mechanical Design 127, no. 1 (2005): 78–85. http://dx.doi.org/10.1115/1.1825044.

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Functional testing of prototypes is a critical step in the development of many of today’s products. Results of functional tests allow for verification of proper performance before a product is introduced into the market. The advent of rapid prototyping technologies offers engineers the potential to dramatically reduce the prototype-test-verify cycle and get products to market quickly. However, dimensional and material property limitations of rapid prototypes often prevent them from being used for functional testing without the use of similitude methods to correlate measured prototype behavior

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17

Singh, Nishant Kumar, Yashvir Singh, and Abhishek Sharma. "A Mathematical Model to Assess the Material Removal Rate during Gas-Assisted Electrical Discharge Drilling Process." International Journal of Mathematical, Engineering and Management Sciences 5, no. 6 (2020): 1333–44. http://dx.doi.org/10.33889/ijmems.2020.5.6.099.

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This research work investigates the use of Gas-Assisted Electrical Discharge Drilling (GAEDD) of high carbon-chromium die steel. The poor material removal rate (MRR) is one of the profound drawbacks of the traditional Electrical Discharge Drilling (EDD) process. Hence, over the years researchers have been feeling the requisite to develop an advanced strategy that can enhance the MRR. This study has examined the utilization of compressed gas in conventional EDM under the constraint state to assess MRR. The impact of procedure parameters likedischarge current, pulse on time, duty cycle, electrod

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18

Clavero, María, Pilar Díaz-Carrasco, and Miguel Á. Losada. "Bulk Wave Dissipation in the Armor Layer of Slope Rock and Cube Armored Breakwaters." Journal of Marine Science and Engineering 8, no. 3 (2020): 152. http://dx.doi.org/10.3390/jmse8030152.

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The objective of this research is to analyze the interaction of the incident wave train with a mound breakwater (specifically, dissipation in the armor layer) and to quantify the performance of the structure built with different types and sizes of armor units. The generalized Π -Buckingham theorem is invoked to choose a complete set of independent variables that govern the principal interaction processes. The analysis is based on two sets of experimental data obtained in the wave flume of IISTA, University of Granada, and in the wave flume of Aalborg University. The bulk dissipation depends on

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19

Popov, Gencho, Stanislaw Legutko, Kliment Klimentov, and Boris Kostov. "Applying Criteria Equations in Studying the Energy Efficiency of Pump Systems." Energies 14, no. 17 (2021): 5256. http://dx.doi.org/10.3390/en14175256.

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This paper presents a method for evaluating the energy efficiency of pump systems used to transport fluids .It is mainly scientifically applied and engineering-applied in nature and aims to propose a new approach (method) to researchers in their study of the energy efficiency of such systems. By applying the well-known scientific method of Dimensional Analysis (Buckingham π-theorem), dimensionless complexes (π-criterions and their relevant equations, which are original (innovative) and are offered for the first time in the scientific literature), used in accomplishing an energy assessment and

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20

Borovkov, Valery, and Ivan Karaichev. "Oxygen Regime Control in Water Body Amelioration." E3S Web of Conferences 97 (2019): 05029. http://dx.doi.org/10.1051/e3sconf/20199705029.

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An important aspect of water body amelioration is the control of the oxygen regime in water mass. Pollution of water bodies deteriorates their oxygen regime, and the natural inflow of oxygen through the free surface is not enough to compensate for oxygen consumption for pollutant oxidation. Water pollution by various substances causes damage resulting from a decrease in the ecological safety of urban water bodies. Data of World Health Organization (WHO) show that the contact of the population with polluted water bodies causes spreading of deceases, such as cholera, diarrhea, dysentery, hepatit

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21

Ali, Khaled Abdeen Mous, Wangyuan Zong, Hafiz Md-Tahir, Lina Ma, and Liu Yang. "Design, Simulation and Experimentation of an Axial Flow Sunflower-Threshing Machine with an Attached Screw Conveyor." Applied Sciences 11, no. 14 (2021): 6312. http://dx.doi.org/10.3390/app11146312.

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Sunflower threshing is one of the most interesting field processes for making the sunflower ready for seed handling, drying, cleaning and oil extraction. One of the biggest problems observed during the sunflower threshing process is the accumulation of threshed crop on the first third of the threshing roller and passing off some unthreshed parts of sunflower heads. To solve the aforementioned problem and optimize the efficiency of the sunflower threshing process, this research was focused on devising and testing a sunflower threshing machine with a close threshing box system equipped with a sc

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22

Tunnicliffe, Martin, and Gordon Hunter. "Dimensionality, Granularity, and Differential Residual Weighted Entropy." Entropy 21, no. 9 (2019): 825. http://dx.doi.org/10.3390/e21090825.

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While Shannon’s differential entropy adequately quantifies a dimensioned random variable’s information deficit under a given measurement system, the same cannot be said of differential weighted entropy in its existing formulation. We develop weighted and residual weighted entropies of a dimensioned quantity from their discrete summation origins, exploring the relationship between their absolute and differential forms, and thus derive a “differentialized” absolute entropy based on a chosen “working granularity” consistent with Buckingham’s Π -theorem. We apply this formulation to three common c

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23

Opdahl, Hanna, and David Jensen. "Dimensional Analysis and Optimization of IsoTruss Structures with Outer Longitudinal Members in Uniaxial Compression." Materials 14, no. 8 (2021): 2079. http://dx.doi.org/10.3390/ma14082079.

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This study analyzes the buckling behavior of 8-node IsoTruss® structures with outer longitudinal members. IsoTruss structures are light-weight composite lattice columns with diverse structural applications, including the potential to replace rebar cages in reinforced concrete. In the current work, finite element analyses are used to predict the critical buckling loads of structures with various dimensions. A dimensional analysis is performed by: deriving non-dimensional Π variables using Buckingham’s Π Theorem; plotting the Π variables with respect to critical buckling loads to characterize tr

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Kramm, Gerhard, and Fritz Herbert. "Similarity Hypotheses for the Atmospheric Surface Layer Expressed by Non-Dimensional Characteristic Invariants – A Review." Open Atmospheric Science Journal 3, no. 1 (2009): 48–79. http://dx.doi.org/10.2174/1874282300903010048.

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In this paper, similarity hypotheses for the atmospheric surface layer (ASL) are reviewed using nondimensional characteristic invariants, referred to as π-numbers. The basic idea of this dimensional π-invariants analysis (sometimes also called Buckingham’s π-theorem) is described in a mathematically generalized formalism. To illustrate the task of this powerful method and how it can be applied to deduce a variety of reasonable solutions by the formalized procedure of non-dimensionalization, various instances are represented that are relevant to the turbulence transfer across the ASL and prevai

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Singh, Rupinder. "Mathematical Modeling of Sensitization in Resistance Spot Welding of SS." Materials Science Forum 808 (December 2014): 97–102. http://dx.doi.org/10.4028/www.scientific.net/msf.808.97.

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Stainless steel (SS) is sensitized by thermal treatment in the range of 450°C to 800°C and inter-granular attack would occur upon subsequent exposure to certain media. This study is focused on modelling the effect of sensitization (by taking into consideration hardness as the weld property) in resistance spot welding (RSW) of 304SS, before and after cryogenic treatment on tungsten electrode. In the present work, outcome of Taguchi model has been used for developing a mathematical model for sensitization; using Buckingham’s π-theorem. The parameters of significance are coolant flow rate (CFR),

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Pandey, Pulak M., Harsha Goel та Usharani Rath. "Modelling of MRR and hole taper for ultrasonic assisted jet electrochemical micro-drilling process using Buckingham's π theorem". International Journal of Mechatronics and Manufacturing Systems 12, № 2 (2019): 140. http://dx.doi.org/10.1504/ijmms.2019.10024513.

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Goel, Harsha, Usharani Rath та Pulak M. Pandey. "Modelling of MRR and hole taper for ultrasonic assisted jet electrochemical micro-drilling process using Buckingham's π theorem". International Journal of Mechatronics and Manufacturing Systems 12, № 2 (2019): 140. http://dx.doi.org/10.1504/ijmms.2019.102949.

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28

Shiue, Angus, Shih-Chieh Chen, Jyh-Cheng Jeng, Likuan Zhu, and Graham Leggett. "Mixing Performance Analysis of Orbitally Shaken Bioreactors." Applied Sciences 10, no. 16 (2020): 5597. http://dx.doi.org/10.3390/app10165597.

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This study investigated the efficacy of a novel correlation of power input, energy dissipation rate and mixing time as a potential route to identify the orbitally shaken bioreactor (OSB) system. The Buckingham’s π-theorem was used to designate and transform dimensionless Newton numbers with five relevant power input variables. These variables were empirically varied to evaluate the correlation among the dimensionless numbers. The Newton number decreases with the increased shaking frequency and filling volume. Previous work has focused on optimizing the mixing process by evaluating different sh

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Kahlen, Franz-Josef, and Aravinda Kar. "Tensile Strengths for Laser-Fabricated Parts and Similarity Parameters for Rapid Manufacturing." Journal of Manufacturing Science and Engineering 123, no. 1 (1999): 38–44. http://dx.doi.org/10.1115/1.1286472.

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This paper presents a set of process parameter selection rules to deposit a good metal part. A CO2 laser is used to melt metal powder to achieve layer by layer deposition for fabricating three-dimensional parts. Dimensionless numbers characterizing this powder deposition process are identified using Buckingham’s Π-Theorem. These dimensionless numbers are used to identify a range of values for the process parameters, such as the laser power, spot diameter, speed of the xyz stage and powder flow rate, to achieve good quality layers for different materials. The yield and ultimate strengths are ex

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Estrada-Díaz, Jorge A., Alex Elías-Zúñiga, Oscar Martínez-Romero, J. Rodríguez-Salinas, and Daniel Olvera-Trejo. "A Mathematical Dimensional Model for Predicting Bulk Density of Inconel 718 Parts Produced by Selective Laser Melting." Materials 14, no. 3 (2021): 512. http://dx.doi.org/10.3390/ma14030512.

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In this work, dimensional analysis is used to develop a general mathematical model to predict bulk density of SLMed components taking volumetric energy density, scanning speed, powder’s thermal conductivity, specific heat capacity, and average grain diameter as independent variables. Strong relation between dependent and independent dimensionless products is observed. Inconel 718 samples were additively manufactured and a particular expression, in the form of a power-law polynomial, for its bulk density, in the working domain of the independent dimensionless product, was obtained. It is found

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31

Gao, Xuedong, Qiyu Huang, Xun Zhang, Xiangrui Zhu, and Yu Zhang. "A New Wax Removal Empirical Model of Fully Coated Foam Pig." SPE Journal 26, no. 02 (2021): 737–49. http://dx.doi.org/10.2118/205011-pa.

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Summary Wax deposition is one of the most significant challenges for flow assurance. In a conventional pigging operation, a fully coated foam pig is regularly used to mitigate wax deposition. This work attempts to assess, qualitatively and quantitively, the wax removal process of the fully coated foam pig. The experimental results confirm that the wax removal process of the fully coated foam pig includes four phases; namely, the buildup phase, preplug phase, plug phase, and production phase. Moreover, the effects of coating hardness, wax layer thickness, and the shear strength of wax sample on

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32

"Dimensional Analysis and Implicit Function: An Application to Textual Data." WSEAS TRANSACTIONS ON BUSINESS AND ECONOMICS 17 (March 13, 2020). http://dx.doi.org/10.37394/23207.2020.17.11.

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The purpose of the research is to test the viability and usefulness of the dimensional analysis based on the Vaschy-Buckingham Π theorem and implicit function applied to textual data. The method uses hermeneuticalanalysis that allows identifying most frequent words, phrases, and the colocations of words, defining words as categories, and then, as fundamental and derived variables; collocation textual analysis also provides the word links that create a conceptual structure to building the dimensional matrixes and equations by the Vaschy-Buckingham Π theorem. The Gauss-Jordan method gives a solu

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Najib, A., J. Orfi, H. Alansary та E. Ali. "Application of the Buckingham Π Theorem to Model the Multiple Effect Vacuum Membrane Distillation". Journal of Thermal Science and Engineering Applications 14, № 3 (2021). http://dx.doi.org/10.1115/1.4051450.

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Abstract This study aims to develop a dimensionless model of the vacuum multi-effect membrane distillation (V-MEMD) system through which a preliminary prediction of the most critical performance indicators can be attained. The Buckingham Π theorem was utilized to define dimensionless parameters that enable the predicted relationships associated with independent input parameters to describe the essential performance indicators of the V-MEMD system. The obtained simplified model reduces the design parameters from ten to two effective dimensionless parameters to realize the realistic and actual b

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LaViolette, Marc. "On the History, Science, and Technology Included in the Moody Diagram." Journal of Fluids Engineering 139, no. 3 (2017). http://dx.doi.org/10.1115/1.4035116.

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This paper is a historical review of the science, both experimental and theoretical, behind the iconic Moody diagram used to avoid tedious iterations choosing pumps and pipes. The large body of historical pipe flow measurements and the choice of dimensionless groups and the Buckingham-Π theorem are also discussed. The traditional use of the Moody diagram to solve common pipe flow problem is discussed. Alternatives to the Moody diagram from the literature and novel ones presented here are shown to produce a solution without iteration for any type of pipe loss problem.

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Paul, S. N., Vineet V. Karambelkar, S. N. Rao та J. D. Ekhe. "The Application of Buckingham π Theorem to Modeling Polypyrrole Synthesis done by Chemical Oxidative Polymerization". Indian Journal of Science and Technology 8, № 35 (2015). http://dx.doi.org/10.17485/ijst/2015/v8i35/81003.

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"Development and Validation of Nusselt Number Correlations for Mixed Convection in an Arc-Shape Cavity." International Journal of Engineering and Advanced Technology 9, no. 1 (2019): 526–31. http://dx.doi.org/10.35940/ijeat.a9646.109119.

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The analytical study has been performed to investigate the combined effects of lid movement and buoyancy force parameter on mixed convective flow in an arc-shape cavity. The dimensional analysis based on Buckingham π-Theorem is used in the present study. It results in correlations for Nusselt number in terms of non dimensionalized parameters, viz. Re, Pr, Gr, θ etc. The correlations developed are validated against the experimental data of horizontal arc- shape cavity and numerical data of inclined arc-shape cavity obtained from open literature. The correlation developed in the present study fo

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Fahed, M., I. Barsoum, A. Alfantazi, and M. D. Islam. "Burst Pressure Prediction of Pipes With Internal Corrosion Defects." Journal of Pressure Vessel Technology 142, no. 3 (2020). http://dx.doi.org/10.1115/1.4045886.

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Abstract Corrosion in pipeline walls can lead to severe loss of material to a point which will cause complete loss of pipeline integrity. The contemporary approach of corrosion prevention is to use internal lining system to isolate the corrosive medium from the inner surface of the host pipe. The objective of this study is to assess the burst pressure of pipelines with internal corrosion defects. The mechanical response of carbon steel API X42, X52, and X70 pipe grades are empirically estimated and implemented in a finite element model. The geometry of an internal corrosion defect is defined t

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Suhas, B. G., and A. Sathyabhama. "Experimental Investigation of Heat Transfer Coefficient and Correlation Development for Subcooled Flow Boiling of Water–Ethanol Mixture in Conventional Channel." Journal of Thermal Science and Engineering Applications 9, no. 4 (2017). http://dx.doi.org/10.1115/1.4036202.

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In this present work, bubble dynamics of subcooled flow boiling in water–ethanol mixture is investigated through visualization using a high-speed camera in horizontal rectangular channels. The heat transfer coefficient of water–ethanol mixture during subcooled flow boiling is determined for various parameters like heat flux, mass flux, and channel inlet temperature. The effect of bubble departure diameter on heat transfer coefficient is discussed. A correlation is developed for subcooled flow boiling Nusselt number of water–ethanol mixture. The parameters considered for correlation are grouped

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Lawal, Abiodun Ismail, Seun Isaiah Olajuyi, Sangki Kwon та Moshood Onifade. "A comparative application of the Buckingham π (pi) theorem, white-box ANN, gene expression programming, and multilinear regression approaches for blast-induced ground vibration prediction". Arabian Journal of Geosciences 14, № 12 (2021). http://dx.doi.org/10.1007/s12517-021-07391-x.

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Kanungo, Deepak Kumar, Sachin Kumar Shrivastava, Nand Kumar Singh, and Kirti Chandra Sahu. "Heat Transfer in Supercritical Steam Flowing Through Spiral Tubes." Journal of Heat Transfer 142, no. 11 (2020). http://dx.doi.org/10.1115/1.4047641.

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Abstract We investigate heat transfer in supercritical steam flowing in a spiral tube by conducting three-dimensional numerical simulations. The current numerical solver has been validated with the existing experimental results, and simulations are performed by varying different geometric parameters of a spiral tube. The flow dynamics and heat transfer in a spiral tube are compared against those in a straight tube. For the parameters range considered in the present study, it is found that the heat transfer coefficient (HTC) in the spiral tube is 29% higher than that in the case of a straight t

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Zhang, Wei, and Amin Mehrabian. "Dimensionless Solutions for the Time-Dependent and Rate-Dependent Productivity Index of Wells in Deformable Reservoirs." SPE Journal, May 1, 2021, 1–23. http://dx.doi.org/10.2118/204001-pa.

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Summary Reservoir depletion is known to reduce the porosity and permeability of stress-sensitive reservoir rocks. The effect may substantially hinder the productivity index (PI) of producing wells. This study presents analytical solutions for the time-dependent and steady-state well PIs, respectively, of a bounded, disk-shaped, elastic reservoir with no-flow and constant-pressure conditions at the outer boundary. A combination of Green's functions, the Laplace transform method, and the perturbation technique is used to solve the governing nonlinear partial differential equations of the conside

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Desavale, R. G., R. Venkatachalam, and S. P. Chavan. "Experimental and Numerical Studies on Spherical Roller Bearings Using Multivariable Regression Analysis." Journal of Vibration and Acoustics 136, no. 2 (2014). http://dx.doi.org/10.1115/1.4026433.

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Many industries make wide use of rotor bearing systems such as high speed turbines and generators. However, the vibration of antifriction rotor–bearings is a key factor in reducing the life of the bearings; thus significantly influencing the performance and working life of the whole power plant. In earlier research on the vibration characteristics of high speed rotor–bearing systems, such as in induced draft (ID) fans, an application used in sugar cane factories, the supporting antifriction bearings were simplified as a particle on a shaft with radial stiffness and damping coefficient. However

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