Experimental and Numerical Studies on Water Cooling Tower Performance
Experimental and Numerical Studies on Water Cooling Tower Performance

Waheed Sh. Mohammad; Jalal M. Jalil

Volume 25, Issue 4 , June 2007, Page 512-533

https://doi.org/10.30684/etj.25.4.1

Abstract
  Theoretical and experimental studies were conducted on forced draftwater cooling tower. In such towers, the heat and mass transfer take placefrom the hot water to the bulk air, which ...  Read More ...
Numerical Study of Flow InMechanically Ventilated Rooms Under Non- Isothermal Conditions
Numerical Study of Flow InMechanically Ventilated Rooms Under Non- Isothermal Conditions

Jalal M. Jalil; Talib K. Murtadha; Hanaa M. Mohammed Ali

Volume 25, Issue 4 , June 2007, Page 534-542

https://doi.org/10.30684/etj.25.4.2

Abstract
  A computational procedure was conducted in (3x3x3 m) rooms and in a full–scale model building to study the effect of supply temperature on the roomflow patterns in mechanically ...  Read More ...
The Effect of Size and Location of a Heating Source on the Buoyant Flow in a Heated Space
The Effect of Size and Location of a Heating Source on the Buoyant Flow in a Heated Space

Waheed S. Mohammed; Gazy F. Saloomy; Abdul-Jabar Muttair Ahmed

Volume 25, Issue 4 , June 2007, Page 543-557

https://doi.org/10.30684/etj.25.4.3

Abstract
  A numerical study of two-dimensional turbulent buoyant recirculating flowswithin a heated space is presented. The study involves the solution of elliptic partialdifferential equations ...  Read More ...
Dopping Effect On Optical Constants of Polymethylmethacrylate (PMMA)
Dopping Effect On Optical Constants of Polymethylmethacrylate (PMMA)

Ahmad A. H; Awatif A. M; Zeid Abdul-Majied N

Volume 25, Issue 4 , June 2007, Page 558-568

https://doi.org/10.30684/etj.25.4.4

Abstract
  The optical constants (refractive index (n) , extinction coefficient (k) , realand imaginary parts of dielectric constant(ε1&ε2)) of polymethyl methacrylate(PMMA) ...  Read More ...
A Finite Element Analysis of Orthogonal Machining Using Different Tool Edge Geometries
A Finite Element Analysis of Orthogonal Machining Using Different Tool Edge Geometries

Maan Aabid Tawfiq; Suha Kareem Shahab

Volume 25, Issue 4 , June 2007, Page 569-583

https://doi.org/10.30684/etj.25.4.5

Abstract
  This paper summarizes the effects of edge preparation of the cutting tool inorthogonal cutting on the following variables: stress distributions at the toolrake face, cutting forces ...  Read More ...
Normalized Characteristics of Laser-Induced Diffusion of Arsenic Dopants in Silicon
Normalized Characteristics of Laser-Induced Diffusion of Arsenic Dopants in Silicon

Oday A. Hamadi; Salma M. Hussain

Volume 25, Issue 4 , June 2007, Page 584-590

https://doi.org/10.30684/etj.25.4.6

Abstract
  In this work, normalized characteristics of laser-induced diffusion ofarsenic in silicon are presented. These characteristics are considered as areenhancing the As-doped silicon-based ...  Read More ...
The Effect of Surfactants on Characteristics of Hydrodynamic and Mass Transfer Coefficient in Gas-Liquid Dispersion Column
The Effect of Surfactants on Characteristics of Hydrodynamic and Mass Transfer Coefficient in Gas-Liquid Dispersion Column

Thamer J. Mohammed; Fadi Z. Hanna

Volume 25, Issue 4 , June 2007, Page 591-607

https://doi.org/10.30684/etj.25.4.7

Abstract
  This work studis the effect of liquid properties (water, solution 0.2-1.5 wt% for each of i-propanol, and n-butanol), temperature (26-55 oC) andsuperficial air velocity (1-15cm/s) on ...  Read More ...
Modelling Pressure Drop to Calculate Conversion of Silicon and Methyl Chloride in a Fluidized bed Reactor
Modelling Pressure Drop to Calculate Conversion of Silicon and Methyl Chloride in a Fluidized bed Reactor

Ihsan B. Hamawand

Volume 25, Issue 4 , June 2007, Page 608-618

https://doi.org/10.30684/etj.25.4.8

Abstract
  Three experiments were curried out at different reaction temperatures [ 250, 300,330 oC ], for the reaction of silicon with methyl chloride in a fluidized bed reactor, inorder to evaluate ...  Read More ...
A Numerical Model For Thermal-Hydraulic Design of a Shell And Single Pass Low Finned Tube Bundle Heat Exchanger
A Numerical Model For Thermal-Hydraulic Design of a Shell And Single Pass Low Finned Tube Bundle Heat Exchanger

Ali Hussain Tarrad

Volume 25, Issue 4 , June 2007, Page 619-645

https://doi.org/10.30684/etj.25.4.9

Abstract
  This investigation represents a computerized model for the thermal-hydraulicdesign of a single shell – single pass of enhance tube bundle heat exchanger usingthe step by step ...  Read More ...
Secure E-Mail System Using S/Mime and Ib-Pkc
Secure E-Mail System Using S/Mime and Ib-Pkc

Sufyan T. Faraj; Mohammed T. Ibrahem

Volume 25, Issue 4 , June 2007, Page 646-668

https://doi.org/10.30684/etj.25.4.10

Abstract
  Although e-mail security solutions have been introduced formore than two decades, most of the e-mail messages are sent nowadayswithout being secured by any of these techniques. This ...  Read More ...