MSc

Jan 11, 2020 - Aug 1, 2023

Technical Thermal Engineering from Northern Technical University (Iraq)

Evaluation of Heat Transfer Enhancement from an Oscillation Heat Sink Under Free Convection Heat Transfer

Feb 4, 2026

Journal NTU Journal for Renewable Energy

DOI https://doi.org/10.56286/2vzvbp70

Issue 1

Volume 9

Enhancing heat dissipation in passive cooling systems remains a critical challenge for modern electronic and thermal devices. This study introduces an innovative approach that integrates forced vibration with a rectangular-finned heat sink to enhance free-convective thermal performance. The research investigates the influence of vibration frequency and amplitude on the heat transfer coefficient, fin efficiency, and air mass flow rate under various heat fluxes. Experiments were conducted within a controlled vertical duct test rig equipped with a data logger, anemometer, and electrical instrumentation. Three heat flux levels, 150, 230, and 360 W/m², were examined across vibration frequencies ranging from 0 to 50 Hz and amplitudes between 0.07- and 6.99-mm. Results revealed a direct correlation between the heat transfer coefficient and the modified Rayleigh number, with maximum enhancement observed at 50 Hz. Compared to static conditions (0 Hz), the overall heat transfer coefficient increased by 160%, 59.5%, and 55.2% for the respective heat fluxes, accompanied by air mass flow rate rises of 8.8%, 12.7%, and 25%. Despite these gains, fin efficiency decreased marginally by 9.8t o11.8% due to intensified convective mixing. The findings highlight the novel contribution of mechanical vibration as an effective means to augment natural convection without additional energy input for fluid motion, offering a practical enhancement strategy for passive aluminum-finned heat sinks used in electronic cooling and thermal management systems. . A heat sink is a device used to dissipate heat generated by electrical and electronic devices; it is classified as an active or passive heat sink according to the cooling process. The present study aims to evaluate the effect of forced vibration on heat sink thermal performance. Evaluation of Heat Transfer Enhancement from an Oscillation Heat Sink Under Free Convection Heat Transfer

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A Review of Spur Gear Fault Diagnosis: Monitoring Methods, Predictive Models, and Industrial Challenges

Aug 29, 2025

Journal NTU Journal of Engineering and Technology

publisher NTU

DOI https://doi.org/10.56286/ntujet.v4i3

Issue No. 3 (2025)

Volume 4

Spur gears made from metal serve as central equipment in multiple mechanical configurations. They experience various defects like fatigue cracks, abrasion, and adhesion wear, pitting and scuffing. This review delivers a detailed analysis and performance review of research material from recent studies regarding spur gear failure modes, together with monitoring techniques and predictive models. Where detailed analysis through real-world examinations is conducted, wind energy applications are combined with automotive and manufacturing sector work environments to evaluate diagnostic system performance in practice. In this paper, both benefits and drawbacks across time-domain, frequency domain, and time-frequency domain techniques are analyzed. This includes Fast Fourier Transform, empirical mode decomposition, wavelet transform, and Hilbert-Huang transform, as well as contemporary developments in machine learning diagnostic systems. The research sector identifies three main missing elements: limited availability of fault-labeled data, difficulties in maintaining operational condition generalization, and real-time system implementation. Future work and industrial use of spur gear fault diagnosis solutions need guidance to develop robust interpretive fault detection systems at a large operational scale.

Using Mechanical Vibration to Enhance Heat Transfer on an Extended Surface: A Review Study

Aug 28, 2023

Journal American Journal of Science, Engineering and Technology

publisher sciencepublishinggroup

DOI doi: 10.11648/j.ajset.20230803.16

Volume 8

Abstract: Given the significance of improving heat transfer in thermal engineering equipment, researchers in this field have developed numerous methods for heat transfer improvement. These methods are classified as active and passive. Several researchers consider the use of forced vibration in improving heat transfer to be one of the most significant topics in the applied field. This is because some thermal equipment has this feature due to its nature. As a result, the current study emphasizes research dealing with mechanical vibration in enhancing heat transfer in free convection conditions. The results of these studies agreed that heat transfer by free convection and vibration contributed to improving the thermal performance of thermal equipment compared to its at-rest condition. These studies' findings indicate an increased heat transfer coefficient as frequency is raised, particularly in forced convection heat transfer. However, the limited vibration amplitude has an impact on heat transfer. In some studies, the fin slope was studied in addition to vibration. These studies showed that fin tilting reduces heat transfer optimization value with fin tendencies that produce vibrations. Furthermore, while the vibration process does enhance heat transfer capacity, it is accompanied by certain drawbacks. These include the generation of noise, which can disturbance to humans, as well as potential damage to mechanical components of the equipment.

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