Drag Forces under Longitudinal Interaction of Two Particle

Abbas H. Sulaymon; Sawsan A. M. Mohammed

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Publication Date

Sat Jun 30 2007

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Volume

8

Issue Number

2

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Drag Forces under Longitudinal Interaction of Two Particle

Hydrodynamic interaction drag coefficient

Abbas H. Sulaymon

Sawsan A. M. Mohammed

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Direct measurements of drag force on two interacting particles arranged in the longitudinal direction for particle Reynolds numbers varying from J O to 103 are conducted using a micro-force measurement system. The effect of the interparticle distance and Reynolds number on the drag forces is examined. An empirical equation is obtained to describe the effect of the interparticle distance (l/d) on the dimensionless drag.

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Publication Date

Mon Apr 10 2023

Journal Name

The European Physical Journal Plus

Improved performance of D149 dye-sensitized ZnO-based solar cell under solvents activation effect

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Wed Feb 03 2021

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Structural Concrete

Finite element analysis of rectangular RC beams strengthened with FRP laminates under pure torsion

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Abbas Abdulmajeed

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Publication Date

Tue Jun 01 2021

Journal Name

Iop Conference Series: Earth And Environmental Science

Variation of non-diatomic algae in a martyr monument lake under different climate factors

buthena

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AbstractThe current study was conducted in the environment of the Martyr Monument Lake in the city center of Baghdad during 2019 to monitor the impact of climatic conditions such as drought, water shortage, high temperatures in the environment of the city and the lack of water flow during the years 2015 to 2018 and their effects on some of the physical and chemical factors of water and the dynamics of the phytoplankton community in the lake environment. Heterogeneity of some studied environmental factors, including air and water temperature, permeability, water depth, pH, DO, BOD5, nutrients, nitrate, NO3, and phosphates were found. The results showed the effect of climate change and the pres ... Show More

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(2)

Publication Date

Sat Oct 01 2016

Journal Name

Journal Of Economics And Administrative Sciences

Bayesian Estimator for the Scale Parameter of the Normal Distribution Under Different Prior Distributions

خصائص التوزيع الطبيعي

طريقة الإمكان الأعظم

طريقة العزوم

طريقة بيز

التوزيع الأولي SRIG

التوزيع الأولي non-informative

التوزيع الأولي لعائلة الدالة المرافقة الطبيعية

متوسط مربع الأخطاء (MSE)

متوسط الخطأ النسبي المطلق (MAPE).

The properties of the normal distribution

Maximum likelihood method

Moment estimation method

Bayes method

the SRIG prior distribution

the non-informative prior distribution

the natural conjugate family of priors

Mean Square Error (MSE)

Mean Absolute Percentage Error (MAPE).

جنان عباس

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In this study, we used Bayesian method to estimate scale parameter for the normal distribution. By considering three different prior distributions such as the square root inverted gamma (SRIG) distribution and the non-informative prior distribution and the natural conjugate family of priors. The Bayesian estimation based on squared error loss function, and compared it with the classical estimation methods to estimate the scale parameter for the normal distribution, such as the maximum likelihood estimation and th

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Publication Date

Sun Sep 22 2019

Journal Name

Baghdad Science Journal

Thermal Conductivity Performance of Silica Aerogel after Exposition on Different Heating under Ambient Pressure

Density

Effect of heating

FTIR spectra

Silica aerogel

Thermal insulation

Israa F.

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The varied thermal conductivity (insulation) of silica aerogel with heating for different pH has been investigated, it has been depended on ambient pressure drying method in the preparing silica aerogel samples, also six different pH of samples (1, 2, 3, 7, 8 and 9) were treated under five degree of heating with (50,100,150,200 and 250) ᴼC. This technique is important to test the carry-outs hydrophobic silica to temperature without high-quality material changes in the basic characteristics. The hot-wire technique is used in this work to examine the thermal conductivity, Fourier Transform Infrared Spectroscopy (FTIR) depended to characterize the bonds and their artificial by heating. Resu

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Publication Date

Fri Jun 29 2018

Journal Name

Journal Of Engineering

The Effect of Circular Perforation on a V-Corrugated Fin Performance under Natural Convection

Fin performance

heat sink

natural convection

perforated fin

corrugated fin

Maha Ali

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An experimental investigation has been made to study the influence of using v-corrugated aluminum fin on heat transfer coefficient and heat dissipation in a heat sink. The geometry of fin is changed to investigate their performance. 27 circular perforations with 1 cm diameter were made. The holes designed into two ways, inline arrangement and staggered in the corrugated edges arrangement. The experiments were done in enclosure space under natural convection. Three different voltages supplied to the heat sink to study their effects on the fins performance. All the studied cases are compared with v-corrugated smooth solid fin. Each experiment was repeated two times to reduce the error and the data recorded after reaching t

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Publication Date

Sun Nov 15 2020

Journal Name

Anbar Journal Of Engineering Sciences

Numerical Modelling and Experimental Investigation of Water Distribution in Stratified Soil Under Subsurface Trickle

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Sun Nov 01 2020

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2020 8th Ieee Ras/embs International Conference For Biomedical Robotics And Biomechatronics (biorob)

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Wed Jul 01 2020

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Structural Performance of Slender RC Columns with Cross and Square-Shaped under Compression Load

Antonios

Alaa Hussein

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AbstractThe idea of using slender Reinforced Concrete (RC) columns with cross-shaped (+-shaped) instead of columns with square-shaped was discussed in this paper. The use of +-shaped columns provides many architectural and structural advantages, such as avoiding prominent columns edges and improved the structural response of member. Therefore, this study explores the structural response of slender +-shaped columns experimentally and numerically by nonlinear finite element analysis using Abaqus simulation tools. The results showed an excellent convergence in strength between numerical and test results with an average standard deviation of 0.05 and 0.07. Besides that, the use of +-shaped column ... Show More

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Publication Date

Sun Nov 01 2020

Journal Name

Conference

Study the Response Of The Wind Turbine System under Realistic Working Conditions Using Simulink

Oday I.

ahmed

Wisam T.

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AbstractIn recent years, there has been a very rapid development in the field of clean energy due to the huge increase in the demand, which prompted the manufacturers and the designers to increase the efficiency and operating life of the energy systems and especially for wind turbine. It can be considered that the control unit is the main key of the wind turbines. Consequently, it’s essential to understanding the working principle of this unit and spotlight on the factors which influence significantly on the performance of wind turbine system. Simulink technique is proposed to find the response of the wind turbine system under different working conditions. In this paper, it was investigated ... Show More

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