International Journal of Geology

   
ISSN: 1998-4499
Volume 14, 2020

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 14, 2020


Title of the Paper: Numerical Analysis of Non Contact Transportation System for Wafer Warping

 

Authors: Byeong Sam Kim, Kyoungwoo Park

Pages: 39-44

http://doi.org/10.46300/9105.2020.14.8

Abstract: In this work a comparative analysis of a turbulent jet experiment produced by the injection of dyed water into a shallow tank filled with water of the same density and the results of a numerical modelare presented. Dye was injected with the source fluid as a tracer. The concentration of the dye in the shallow turbulent flow was determined using a video imaging technique.The present laboratory experiments were conducted in a tank of small depth, and it is significantly wide to avoid the effect of the side walls. The space between the parallel walls of the tank can be varied during the experiments. The large-scale turbulent flow in the water sheet between the walls of the tank is confined to essentially two-dimensional motion. The shear on the bottom of the tank is a momentum sink to be considered.A comparison of the numerical resultswith the experimental data showed a very good agreement in terms of the position reached by the jet at different times after injection is initialized. These findings are useful for turbulent modeling of the shallow shear flow and for application to the large scale heat and mass exchange processes in lagoons, lakes, the ocean and the atmosphere.


 

Title of the Paper: Comparative Analysis between Experimental and Numerical Model Results of a Jetin a Shallow Water Tank

 

Authors: Robles L. Jose I., Mejia A. Victor, Palacio P. Arturo, Rodriguez V. Alejandro

Pages: 32-38

http://doi.org/10.46300/9105.2020.14.7

Abstract: In this work a comparative analysis of a turbulent jet experiment produced by the injection of dyed water into a shallow tank filled with water of the same density and the results of a numerical modelare presented. Dye was injected with the source fluid as a tracer. The concentration of the dye in the shallow turbulent flow was determined using a video imaging technique.The present laboratory experiments were conducted in a tank of small depth, and it is significantly wide to avoid the effect of the side walls. The space between the parallel walls of the tank can be varied during the experiments. The large-scale turbulent flow in the water sheet between the walls of the tank is confined to essentially two-dimensional motion. The shear on the bottom of the tank is a momentum sink to be considered.A comparison of the numerical resultswith the experimental data showed a very good agreement in terms of the position reached by the jet at different times after injection is initialized. These findings are useful for turbulent modeling of the shallow shear flow and for application to the large scale heat and mass exchange processes in lagoons, lakes, the ocean and the atmosphere.


Title of the Paper: Numerical Investigation of Suction Muffler in Household Refrigerator Compressor

 

Authors: Umut Can Coskun, Hasan Gunes, Kemal Sarioglu

Pages: 27-31

http://doi.org/10.46300/9105.2020.14.6

Abstract: In this study a numerical investigation of a suction muffler in a hermetic reciprocating compressor of a domestic refrigerator is performed using a finite volume based flow solver (Fluent). In order to reveal the behavior of the flow realistically, unsteady experimental pressure data has been used in the outlet boundary condition for the simulations. Detailed investigations are carried out to reveal the instantaneous flow behavior in different muffler sections such as channel and chambers based on the mass flow rate variation with respect to crankshaft angle. It is shown that there is a phase shifting between the mass flow rates through the chamber inlets. Future studies are underway to improve and optimize the muffler design in an effort to maximize the flow rate while keeping the noise levels at a minimum.


 

Title of the Paper: Characteristic of Free-rolling Motion of Two-Dimensional Rectangular Body in the Regular Wave

 

Authors: H. J. Kim, J. H. Jung, H. H. Chun, H. S. Yoon

Pages: 22-26

http://doi.org/10.46300/9105.2020.14.5

Abstract: This study investigated the characteristics of rolling motion of rectangular body for regular waves with a range of wave periods that are equal to and longer than its natural roll period. Using the volume of fluid (VOF) method based on the finite volume method with standard k-ε turbulence model, twodimensional (2D) incompressible viscous two-phase flow is simulated in a wave tank with the rectangular body. The present study introduces a wave period ratio (Tr=TW/TN) of an incident wave period (TW) to the roll natural period (TN) of body. The wide range of 1≤ Tr ≤2.5 is considered in this study. In the wave periods considered in this study, the roll motion shows two distinct patterns. One is the single oscillatory motion which appears in the period ratio of 1≤ Tr ≤1.7. The other is the double oscillatory motion in 1.8≤ Tr ≤2.5. In these two regimes, flow and the roll motion of the rectangular body, which are induced by the fluid flow-structure interaction for various wave periods, are carefully investigated to reveal the mechanism of two roll modes.


Title of the Paper: Reliability-based Optimization of Maintenance Scheduling of Mechanical Components with the Method of Accelerated Tests

 

Authors: Chouairi Asmâa, El Ghorba Mohamed, Benali Abdelkader, Hachim Abdelilah

Pages: 15-21

http://doi.org/10.46300/9105.2020.14.4

Abstract: To have effective production planning and control, it is necessary to calculate the reliability and maintenance of a production system as a whole. Therefore, with today’s highly reliable components, we are often unable to obtain a reasonable amount of test data under normal use condition. For this reason, accelerated tests method is the reasonable procedure to be applied. It is used to determine the reliability of a product in a short period of time by accelerating the use environment. Application of the method of accelerated tests can save cost that we used to pay for overcoming the dilemma of not being able to estimate failure rates by testing directly at use conditions. In this paper, we propose a practical method for system reliability analysis. Among the existing methods for system reliability analysis, reliability graph theory is particularly attractive due to its intuitiveness, which is an extension of the conventional reliability graph. A function library was developed and designed to calculate the reliability-maintainability and availability of parallel series complex systems, whose functional description is translated into a block diagram that combines in series and parallel components studied. An Extensive analytical modeling study has been performed also to verify the effectiveness of the proposed technique.


Title of the Paper: Investigation on Dynamics of Sediment and Water Flow in a Sand Trap

 

Authors: M. R. Mustafa, R. B. Rezaur, A. R. Tariq, M. Javed

Pages: 9-14

http://doi.org/10.46300/9105.2020.14.3

Abstract: Sediment and flow dynamics in a sand trap ofGolen Gol hydropower project in Pakistan was evaluated using aComputational Fluid Dynamics (CFD) model. SedimentSimulation in Intakes with Multi Block Options (SSIIM) CFDmodel was used to simulate the sediment and flow behavior in thesand trap. Numerical simulation results demonstrated that thehorizontal and vertical component of velocities at any region ofsettling basin was less than the designed critical flow velocity ofthe sand trap. The design with respect to dimensions andproportioning of the sand trap were found appropriate forinducing low flow velocities throughout the settling basin of thesand trap supporting the deposition of sediments. The resultsobtained from simulation further presented the 100% removal ofthe desired sediments (particle size class ≥ 0.205 mm diameter)could be achieved in the sand trap. All this verify the design ofsand trap is in accordance with the desired designed sedimentremoval efficiency of the sand trap.


Title of the Paper: The Effect of MHD and Brinkman Number on Laminar Mixed Convection of Newtonian Fluid between Vertical Parallel Plates Channel

 

Authors: Ebrahim Salehi, Rasul Alizadeh, Alireza Darvish

Pages: 4-8

http://doi.org/10.46300/9105.2020.14.2

Abstract: This study investigates MHD and Brinkman number on mixed convection flow in a two parallel-plates vertical channel with reference to laminar, thermal and hydrodynamical developing flow of Newtonian fluid. The boundaries are considered to be isothermal with equal temperatures. The governing equations are solved numerically. Also, their dependence upon certain material parameters have been studied. Velocity, temperature, pressure gradient and Nusselt number profiles have also been presented.


Title of the Paper: The New Method of Finding of Optimal Regularization Parameter for Potential Field Transformation

 

Authors: Pyankov Valentin, Rublev Alexey

Pages: 1-3

http://doi.org/10.46300/9105.2020.14.1

Abstract: We have investigated the morphology of the negative regional gravity anomaly with maximal value near 300 mGl at different altitudes (Sierra Nevada Batholith). This gravity anomaly spatially coincides with the structures of San Andreas and Calaveras faults (20-55 degrees S and 90-140 degrees W). A summary of the geological-geophysical data described the structure near transform fault system San Andreas and a thin structure of the master fault (San Andreas Fault), which accommodated more than a half of the relative shear movements of the Pacific and North American lithospheric plates, are used. In this paper we apply the technique of filtration of the long- and short-wave components of the amplitude spectrum of anomalies, using numerical methods of field simulation at various altitudes. For creation the multilayer gravity model of the Earth crust we need to know the field morphology of different earth layers. For this purpose we have investigated the optimal regularization parameters for gravitational field transformation.