Delale, Canfuad

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Profile URL
https://hdl.handle.net/20.500.11779/2689
Name Variants
Delale, Can Fuad
Delale, Can F. F.
Delale, Can F
Delale, Can Fuat
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Email Address
delalec@mef.edu.tr
Main Affiliation
02.03. Department of Mechanical Engineering
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Current Staff
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ORCID ID
0000-0002-4577-9201
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WoS Researcher ID
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1728691249-academic-1400000054.avif (16.68 KB)

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Scholarly Output

6

Articles

3

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1415/3695

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0

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WoS Citation Count

12

Scopus Citation Count

13

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2

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2

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2

WoS Citations per Publication

2.00

Scopus Citations per Publication

2.17

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4

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0

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19. Mekanik Ulusal Kongresi, XIX. Ulusal Mekanik Kongresi1
AIP Advances1
Conference: 9th International Symposium on Cavitation (CAV) Location: Ecole Polytechnique Federale Lausanne, Lausanne, SWITZERLAND Date: DEC 06-10, 20151
Moment Expo Makine İhracatçıları Birliği Aylık Makine İhracatı ve Ticareti Dergisi1
Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi1
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Now showing 1 - 6 of 6
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    Article
    Sanki-bir-boyutlu Kavitasyonlu Lüle Akışlarının Yeni Kabarcık Gaz Basıncı Yasasıyla Modellenmesi
    (Niğde Ömer Halisdemir Üniversitesi, 2019) Delale, Can Fuat; Morkoyun, Uğurcan; Kaya, Mehmet; Pasinlioğlu, Şenay; Ayder, Erkan
    The aim of this study is to develop a hydrodynamic cavitation model that is compatible with the results of the experiments and that can be adapted to commercial software. For this reason a hydrodynamic cavitation model that takes into account all of the damping mechanisms using the novel bubble gas pressure law is developed for quasi-one-dimensional bubbly cavitating nozzle flows. In this model the bubbly liquid is assumed to be a twophase homogeneous mixture, the Rayleigh-Plesset equation is employed for bubble dynamics, and bubble nucleation process is neglected. The first order system of equations thus obtained for quasi-one-dimensional cavitating nozzle flows is transformed into an initial value problem for the bubble radius and the pressure coefficient. A numerical code is then written to solve this initial value problem by the adaptive step size RungeKutta-Fehlberg method. Results obtained at the experimental conditions were compared and interpreted with the results of experiments.
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    Article
    Citation - WoS: 8
    Citation - Scopus: 9
    On the Gas Pressure Inside Cavitation Bubbles
    (Aip Publishing, 2023) Pasinlioğlu, Şenay; Delale, Can F. F.
    The validity of the reduced order [Delale and Pasinlioglu, Acoustic cavitation model based on a novel reduced order gas pressure law, AIP Adv. 11, 115309 (2021)] and of classical polytropic gas pressure laws during the response of a bubble to variations in the pressure of the surrounding liquid is investigated. In particular, from the exact expression of the gas pressure coupled to the thermal behavior of gas bubbles, we identify the conditions where the reduced order gas pressure law and the classical polytropic law hold. We then distinguish three regimes for the change of state of the bubble during its nonlinear oscillations as the nearly isothermal, transition, and nearly adiabatic regimes, depending on the value of the polytropic index, and we determine the mean value of the polytropic index in each regime by averaging over a parameter, which is a function of the Peclet number based on the characteristic thermal diffusion time. The results of the temporal evolution of the bubble radius, the bubble wall temperature, and the partial gas pressure inside the bubble are presented using an acoustic cavitation model based on the reduced order gas pressure law for both constant and variable interface properties.
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    Article
    Citation - WoS: 1
    Citation - Scopus: 1
    Acoustic Cavitation Model Based on a Novel Reduced Order Gas Pressure Law
    (2021) Pasinlioğlu, Şenay; Delale, Can Fuad
    The thermal behavior of a spherical gas bubble in a liquid excited by an acoustic pressure signal is investigated by constructing an iterative solution of the energy balance equations between the gas bubble and the surrounding liquid in the uniform pressure approximation. This iterative solution leads to hierarchy equations for the radial partial derivatives of the temperature at the bubble wall, which control the temporal rate of change of the gas pressure and gas temperature within the bubble. In particular, a closure relation for the hierarchy equations is introduced based on the ansatz that approximates the rapid change of state during the collapse of the bubble from almost isothermal to almost adiabatic behavior by time averaging the complex dynamics of change of state over a relatively short characteristic time. This, in turn, leads to the desired reduced order gas pressure law exhibiting power law dependence on the bubble wall temperature and on the bubble radius, with the polytropic index depending on the isentropic exponent of the gas and on a parameter that is a function of the Péclet number and a characteristic time scale. Results of the linear theory for gas bubbles are recovered by identifying this parameter as a function of the Péclet number based on the Minnaert frequency. The novel gas pressure law is then validated against the near-isothermal solution and against the results of the numerical simulations of the original energy balance equations for large amplitude oscillations using spectral methods. Consequently, an acoustic cavitation model that accounts for phase change but that neglects mass diffusion is constructed by employing the reduced order gas pressure law together with the Plesset–Zwick solution for the bubble wall temperature and the Keller–Miksis equation for spherical bubble dynamics. Results obtained using variable interface properties for acoustically driven cavitation bubbles in water show that the time variations of the bubble radius and the bubble wall temperature lie between those obtained by the isothermal and adiabatic laws depending on the value of the Péclet number and the characteristic time scale.
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    Conference Object
    Kabarcık Dinamiği için Gaz Basıncı Yasası
    (2015) Delale, Can Fuat; Pasinlioglu, Şenay
    ...
  • Thumbnail Image
    Conference Object
    Citation - WoS: 3
    Citation - Scopus: 3
    First Iterative Solution of the Thermal Behaviour of Acoustic Cavitation Bubbles in the Uniform Pressure Approximation
    (2015) Delale, Can Fuat; Pasinlioglu, Şenay
    The thermal behaviour of a spherical gas bubble in a liquid driven by an acoustic pressure is investigated in the uniform pressure approximation by employing an iterative method to solve the energy balance equations between the gas bubble and the surrounding liquid for the temperature distribution and the gas pressure inside the bubble. It is shown that the first iterative solution leads to the first order law of the gas pressure as a polytropic power law of the bubble wall temperature and of the bubble radius, with the polytropic index given as an explicit function of the isentropic exponent of the gas. The resulting first order law of the gas pressure reduces to the classical isothermal and adiabatic laws in the appropriate limits. The first order gas pressure law is then applied to an acoustically driven cavitation bubble by solving the Rayleigh-Plesset equation. Results obtained show that the bubble wall temperature pulsations during collapse and rebound can become a few orders of magnitude higher than the bulk liquid temperature.
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    Other
    Mef Üniversitesi Mühendislik Fakültesi, Makine Mühendisliği Bölüm Başkanı Prof. Dr. Can Fuat Delale ile Röportaj
    (Moment Expo Dergisi, 2016) Delale, Can Fuat
    “Amacımız Fark Yaratacak Makine Mühendisleri Yetiştirmek” Gelişen teknolojiye ayak uydurabilen, teknik bilgi ve becerilere sahip fark yaratacak lider makine mühendisleri yetiştirmek üzere yola çıktıklarını belirten MEF Üniversitesi Makine Mühendisliği Bölüm Başkanı Prof. Dr. Can Fuat Delale, eğitim ve öğretimde kullandıkları “Flipped Classroom” (ters yüz edilmiş sınıf) yöntemiyle öğrencilerin; önceden hazırlanmış kısa süreli videoları online izleyip, gerekli diğer gereçleri de kullanarak derslere hazırlıklı geldiğini, ders esnasında da üç ya da dört kişilik gruplar halinde öğretim üyesinin yardımıyla etkileşerek öğrenme ve uygulama süreçlerini daha sağlıklı gerçekleştirebildiklerinin altını çiziyor. Prof. Dr. Can Fuat Delale, bölümün yapısı, sunduğu eğitim olanakları ve sanayi kuruluşlarıyla birlikte yürütülen projelerle ilgili Moment Expo Dergisi’nin sorularını yanıtladı.