Research Paper
Computational Single and Multiphase Approaches to Investigate the Hydrothermal Behavior of Hybrid Nano-fluid in Plain and Wavy Tubes
Computational Single and Multiphase Approaches to Investigate the Hydrothermal Behavior of Hybrid Nano-fluid in Plain and Wavy Tubes

Ahmed S. Habeeb; Sattar Aljabair; AbdulHassan A. Karamallah

Volume 41, Issue 7 , July 2023, Page 886-903

https://doi.org/10.30684/etj.2023.136449.1316

Abstract
  The newest class of heat transfer improvement is accomplished by using hybrid Nano-fluids. Therefore, the heat transfer and pressure drop of a mixture of Iron oxide (Fe3O4) and Magnesium ...  Read More ...
Research Paper
Experimental and Numerical Study of Spur Gears With Lightening Holes
Experimental and Numerical Study of Spur Gears With Lightening Holes

Almurtadha A. Ahmed; Ali R. Hassan

Volume 41, Issue 7 , July 2023, Page 904-914

https://doi.org/10.30684/etj.2023.134713.1246

Abstract
  The gear is a very important component of power transmission in a flying vehicle and rotating mechanisms etc... In this paper, the dynamic effect and stresses generated as a result ...  Read More ...
Research Paper
Investigation of Frequency-Domain-Based Vibration Signal Analysis for UAV Unbalance Fault Classification
Investigation of Frequency-Domain-Based Vibration Signal Analysis for UAV Unbalance Fault Classification

Luttfi A. Al-Haddad; Alaa A. Jaber; Paramin Neranon; Sinan A. Al-Haddad

Volume 41, Issue 7 , July 2023, Page 915-923

https://doi.org/10.30684/etj.2023.137412.1348

Abstract
  The flying reliability of Unmanned Aerial Vehicles (UAVs) and flying robots, which directly determines the operational degree of safety, is becoming more important in recent intelligent ...  Read More ...
Research Paper
Effect of ECAP process on mechanical properties and microstructure of AA-6061 recycled chips
Effect of ECAP process on mechanical properties and microstructure of AA-6061 recycled chips

Rawa H. Mohammed; Ayad F. Shahab; Alireza Rezaei

Volume 41, Issue 7 , July 2023, Page 924-939

https://doi.org/10.30684/etj.2023.137807.1367

Abstract
  The oxidation of aluminum machined chips makes successful recycling via the traditional re-melting technique difficult. A viable solution to this problem is to utilize solid-state recycling ...  Read More ...
Research Paper
Mathematical Model of Properties and Experimental Fatigue Investigation at Elevated Temperatures of Functionally Gradient Materials
Mathematical Model of Properties and Experimental Fatigue Investigation at Elevated Temperatures of Functionally Gradient Materials

Ziadoon M.R Al-hadrayi; Ahmed N. Al-Khazraji; Ahmed A. Shandookh

Volume 41, Issue 7 , July 2023, Page 940-953

https://doi.org/10.30684/etj.2023.137509.1352

Abstract
  Fatigue that occurs at elevated temperatures is called thermal fatigue. High temperatures and cycling loads cause thermal fatigue that can cause component failures. In this paper, induced ...  Read More ...
Research Paper
The Effect of Electrode Geometry and Pre-heating Treatment on Resistance Spot Welding Strength
The Effect of Electrode Geometry and Pre-heating Treatment on Resistance Spot Welding Strength

Lana I. Hassan; Hameed D. Lafta

Volume 41, Issue 7 , July 2023, Page 954-962

https://doi.org/10.30684/etj.2023.138070.1371

Abstract
  Resistance spot welding (RSW) is one of the most significant and common metal joining methods used in industries. The present paper discusses the comparative performance of resistance ...  Read More ...
Research Paper
The Effect of Vibrating Inner Cylinder on Natural Convective Heat Transfer in Concentric and Eccentric Horizontal Cylindrical Annuli
The Effect of Vibrating Inner Cylinder on Natural Convective Heat Transfer in Concentric and Eccentric Horizontal Cylindrical Annuli

Baydaa K. Khudhair; Adel M. Saleh; Ali L. Ekaid

Volume 41, Issue 7 , July 2023, Page 963-978

https://doi.org/10.30684/etj.2023.137848.1362

Abstract
  In this study, natural heat convection caused by centric and vertically eccentric long horizontal cylinders under the influence of vibration is experimentally investigated. The internal ...  Read More ...
Research Paper
Performance Evaluation of PV Panel Powered Dual Thermoelectric Air Conditioning System
Performance Evaluation of PV Panel Powered Dual Thermoelectric Air Conditioning System

Mustafa M. Salman; Mahmoud M. Mahdi; Majida K. Ahmed

Volume 41, Issue 7 , July 2023, Page 979-990

https://doi.org/10.30684/etj.2023.138058.1370

Abstract
  Thermoelectric air condition system (TEACs) powered by solar photovoltaics is useful for thermal comfort applications, especially when there is a direct energy source like sunlight. ...  Read More ...
Research Paper
Exploring the effects of a new lifter design and ball mill speed on grinding performance and particle behaviour: A comparative analysis
Exploring the effects of a new lifter design and ball mill speed on grinding performance and particle behaviour: A comparative analysis

Ali Safa; Sahraoui Aissat

Volume 41, Issue 7 , July 2023, Page 991-1000

https://doi.org/10.30684/etj.2023.138456.1394

Abstract
  Ball mills are the leading grinding equipment in the mineral processing industry. Balls are the primary component in the grinding of materials. Lifters lift these balls to the shoulder ...  Read More ...
Research Paper
Impact of Cooling Fluid Temperature on the Structural Integrity of Gas Turbine Stator Blades
Impact of Cooling Fluid Temperature on the Structural Integrity of Gas Turbine Stator Blades

Olumide Towoju

Volume 41, Issue 7 , July 2023, Page 1001-1009

https://doi.org/10.30684/etj.2023.138881.1409

Abstract
  The importance of gas turbine engines to the aviation industry cannot be overemphasized. Being a major part of aircrafts and jets, its reliability must be second to none. They are continuously ...  Read More ...
Research Paper
Analytical Study of Free Vibration Characteristics For Sandwich Cylindrical Shell With Single Phase Metal Core
Analytical Study of Free Vibration Characteristics For Sandwich Cylindrical Shell With Single Phase Metal Core

Ahmed Mouthanna; Sadeq H. Bakhy; Muhannad Al-Waily

Volume 41, Issue 7 , July 2023, Page 1010-1025

https://doi.org/10.30684/etj.2023.139795.1441

Abstract
  This paper presents an analytical investigation of the nonlinear vibration characteristics of a single-phase functionally graded cylindrical shell panel with various porous metal cores. ...  Read More ...
Research Paper
Comparative Study of Induction Motor and Steam Turbine at Kebon Agung Sugar Factory Malang Indonesia
Comparative Study of Induction Motor and Steam Turbine at Kebon Agung Sugar Factory Malang Indonesia

Roro Heni Hendaryati; Sudarman Sudarman; Damario Indra Baskoro; Nyoto Susilo; Cucut Hendra Pamungkas; Willy Satrio Nugroho; Yepy Komaril Sofi'i

Volume 41, Issue 7 , July 2023, Page 1026-1033

https://doi.org/10.30684/etj.2023.139996.1449

Abstract
  Induction motors and steam turbines are the main components in the sugar cane milling process. This study analyzes the efficiency of induction motors and steam turbines as mill drives ...  Read More ...