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    Circular perforations on vertically sinusoidal wave form plate fin heat sinks for laminar natural convection heat dissipation
    (Elsevier France-Editions Scientifiques Medicales Elsevier, 2025) Taha, Mohammed Salam; Ates, Ali; Canli, Eyub; Altun, Aziz Hakan
    Aluminum straight plate fin heat sink geometry was modified with vertical sinusoidal wave profile on the fins for different amplitudes. The heat sink fins were further modified by means of circular perforations with increasing diameters. Fully experimental examination was adopted for conducting the work. The heat sinks were assessed on a heat source to see the effect of the modifications on the heat sink fins in terms of heat sink base plate temperature. Heat source was controlled so that the natural convection heat transfer remained in the laminar regime. The experimental methodology elaborately described to share practical experiences on implicit nature and critical points of the commonly used approaches. Up to 40 W heat dissipation is realized with the heat sinks while 2.5 x 106 6 Rayleigh number value bases a limit for the natural convection potential. The perforations on the fins reduce the performance difference between different wave form amplitudes towards the favorable direction. The 3 mm and 6 mm perforations on the sinusoidally wavy fin profile with 1 mm amplitude value result the least base plate surface temperatures. Therefore, when the cost is justified by the performance improvement, perforations on plate fin heat sinks are recommended in terms of passive cooling applications. In terms of thermal application, present results indicate thermal performance increase of plate fin heat sinks by perforations on the fin surfaces. The experiences throughout the experimental process in the present work reveal unintuitive, implicit, and covert phenomena about the insulation box design and heating power measurement, which are elucidated in the present content. Insulation box can function as an additional heat dissipation surface at the proximity of the heat sink based on the box design. The voltage measurement approach, which is shallowly mentioned in the literature most of the time, can have an effect on the absolute values of the heat dissipation value.
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    Öğe
    Cooling Car Seats by Redesigning the Standard Air Conditioning System
    (Sinop University, 2024) Ates, Ali
    For a safe journey, not only vehicle safety systems but also the thermal comfort of the human body should be considered. In addition to the passengers during the journey, it is extremely important for the driver to feel comfortable while driving. In this study, some modifications have been made to a conventional vehicle air conditioner by considering the thermal comfort of the human body. It has been calculated that a more comfortable driving experience can be achieved with a more effective air conditioning system. For this purpose, experimental studies were carried out by redesigning the driver's seat of a car. As a result of the studies, the best results in cooling processes were obtained for average revolutions. The obtained findings have been supported and interpreted with graphic outputs.
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    Öğe
    Heat transfer in two-zone thick-walled pipes with axial varying periodic temperature boundary condition
    (Yozgat Bozok Üniversitesi, 2024) Ates, Ali
    The combined heat transfer in thick-walled pipes is investigated by also considering axial heat conduction. The problem considers a two-zone infinite pipe. There is a constant outer wall temperature boundary condition in the upstream region of the pipe. In the downstream region, the outer wall temperature is assumed to vary periodically in the axial direction spatially. This problem, where the flow is assumed to be laminar, is solved numerically by the finite difference method. The effects of the basic parameters of wall thickness ratio, Peclet number, wall-fluid thermal conductivity coefficient ratio and wall-fluid thermal diffusivity coefficient ratio on the interface heat flux are investigated. The effects of the axial dimensionless frequency on the results are also taken into account in the studies. The results obtained are highly dependent on the parametric values. It is observed that the wall thickness ratio is more effective than the other parametric values. In addition, it can be said that the pipe wall and fluid axial conduction cause heat transfer to the upper flow region at a non-negligible scale.