{
    "article_id": 1248,
    "public_id": "a800ca83-f245-48b7-b544-33a8d55bf04d",
    "internal_identifier": null,
    "source_identifier": "84:91",
    "status": "published",
    "type": "research_article",
    "title": "Karbon Nanotüp Nanoakışkanının Geriye Dönük Adım Akışında Isı Transferi ve Akış Karakteristiğinin Araştırılması",
    "title_secondary": null,
    "abstract": "Geriye dönük adım akışı, ısı depolama kaplarının iç ve dış akışında veya güç dönüştürme sistemlerinin toplayıcıları gibi birçok cihazda önemli olup akışın karmaşık yapısı nedeniyle önemli geometrik modellerden biri olarak göze çarpmaktadır. Bu çalışmada, dikey olarak yerleştirilmiş geriye dönük adım akışı geometrisinde h/2 ve 3h/4 olmak üzere farklı pah uzunluklu adım köşe yapılarının pahsız (normal) geometriye göre ısı transferi ve türbülanslı akış özellikleri sayısal olarak incelenmiştir.Geriye dönük adım geometrisinde duvarlardan yalnızca bir tanesi sabit sıcaklıkta tutulurken, diğer duvarlar adyabatiktir. Çalışma akışkanı olarak saf su ve hacimce %0.01 konsantrasyonlu MWCNT-saf su nanoakışkanı kullanılmıştır. Adım genişleme oranı 1.5’ dir. Çalışmanın sonuçları, üç boyutlu, zamandan bağımsız olarak korunum denklemlerinin k-ε türbülans modelli, Boussinesq yaklaşımıyla sonlu hacimler yöntemi olan ANSYS-FLUENT programının kullanılarak çözülmesiyle elde edilmiştir. Sunulan çalışma, literatürde bulunan çalışmanın sayısal sonuçlarıyla karşılaştırılmış olup birbirleriyle uyumlu ve kabul edilebilir olduğu görülmüştür. Sonuçlar, Nu sayısı, akışkanın sıcaklık, türbülans kinetik enerji ve basınç değişimleri olarak sunulmuştur. Ayrıca, geriye dönük adım akışı geometrisinde, sıcaklık, hız ve akım çizgileri dağılımları görselleştirilmiştir. Re=10000 için adım geometrisinin aşağı akım bölgesinde MWCNT-saf su nanoakışkanının kullanıldığı normal geometrinin 3h/4 adım geometrisine göre yaklaşık %8.9 daha fazla ortalama Nu sayısı artışı sağladığı belirlenmiştir.   ",
    "language": "tr",
    "english_title": "Research of Heat Transfer and Flow Characteristics of Carbon Nanotube Nanofluid at Backward-Facing Step Flow",
    "english_abstract": "The backward-facing step flow is important in many devices, such as the internal and external flow of heat storage containers or the collectors of power conversion systems, and stands out as one of the important geometric models due to the complex structure of the flow. In this study, heat transfer and turbulent flow properties of step corner structures with different chamfer lengths as h/2 and 3h/4 according to smooth (without chamfer) geometry have been numerically investigated at vertically placed backward-facing step flow geometry. In the backward-facing step geometry, only one of the walls has been kept at a constant temperature, while the other walls are adiabatic. Distilled water and MWCNT-distilled water nanofluid with a concentration of 0.01% by volume have been used as working fluid. Step expansion rate is 1.5. The results of the study have been obtained by solving three-dimensional, steady conservation equations using k-ε turbulence model, ANSYS-FLUENT program which is finite volume method with Boussinesq approach. The present study has been compared with the numerical results of the work found in the literature and it has been found that they are compatible and acceptable with each other. The results have been presented as the variations of Nu number, fluid temperature, turbulence kinetic energy and pressure. In addition, temperature, velocity and streamline distributions have been visualized in backward-facing step flow geometry. For Re=10000, normal geometry the where MWCNT-distilled water nanofluid has been used in the downstream region of the step geometry has provided an average Nu number increase of approximately 8.9% according to 3h/4 step geometry.",
    "doi": "10.36287/setsci.4.6.091",
    "doi_url": "https://doi.org/10.36287/setsci.4.6.091",
    "resource_url": "https://www.set-science.com/a/a800ca83-f245-48b7-b544-33a8d55bf04d",
    "pdf_url": "https://www.set-science.com/a/a800ca83-f245-48b7-b544-33a8d55bf04d/pdf",
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    "authors": [
        {
            "public_id": "61eaf584-68c4-463a-87e4-d96e9d40bd51",
            "given": "Doğan Engin",
            "family": "Alnak",
            "full": "Doğan Engin Alnak",
            "literal": null,
            "orcid": null,
            "orcid_url": null,
            "email": "kkarabulut@cumhuriyet.edu.tr",
            "corresponding": false,
            "sequence": "first",
            "affiliations": [
                {
                    "name": "Sivas Cumhuriyet University",
                    "department": null,
                    "country": null,
                    "country_code": null,
                    "ror": null,
                    "ror_url": null
                }
            ]
        },
        {
            "public_id": "5c225d99-0834-49b0-8ac4-542d50dcc494",
            "given": "Koray",
            "family": "Karabulut",
            "full": "Koray Karabulut",
            "literal": null,
            "orcid": null,
            "orcid_url": null,
            "email": "kkarabulut@cumhuriyet.edu.tr",
            "corresponding": true,
            "sequence": "additional",
            "affiliations": [
                {
                    "name": "Sivas Cumhuriyet University",
                    "department": null,
                    "country": null,
                    "country_code": null,
                    "ror": null,
                    "ror_url": null
                }
            ]
        }
    ],
    "keywords": [],
    "translations": [
        {
            "language": "en",
            "title": "Research of Heat Transfer and Flow Characteristics of Carbon Nanotube Nanofluid at Backward-Facing Step Flow",
            "abstract": "The backward-facing step flow is important in many devices, such as the internal and external flow of heat storage containers or the collectors of power conversion systems, and stands out as one of the important geometric models due to the complex structure of the flow. In this study, heat transfer and turbulent flow properties of step corner structures with different chamfer lengths as h/2 and 3h/4 according to smooth (without chamfer) geometry have been numerically investigated at vertically placed backward-facing step flow geometry. In the backward-facing step geometry, only one of the walls has been kept at a constant temperature, while the other walls are adiabatic. Distilled water and MWCNT-distilled water nanofluid with a concentration of 0.01% by volume have been used as working fluid. Step expansion rate is 1.5. The results of the study have been obtained by solving three-dimensional, steady conservation equations using k-ε turbulence model, ANSYS-FLUENT program which is finite volume method with Boussinesq approach. The present study has been compared with the numerical results of the work found in the literature and it has been found that they are compatible and acceptable with each other. The results have been presented as the variations of Nu number, fluid temperature, turbulence kinetic energy and pressure. In addition, temperature, velocity and streamline distributions have been visualized in backward-facing step flow geometry. For Re=10000, normal geometry the where MWCNT-distilled water nanofluid has been used in the downstream region of the step geometry has provided an average Nu number increase of approximately 8.9% according to 3h/4 step geometry.",
            "keywords": [
                "Ayrılmış akış, geriye dönük adım akışı, ısı transferi, karbon nanotüp, nanoakışkan"
            ]
        }
    ],
    "subjects": [],
    "subject_names": [],
    "published_date": "2019-12-22",
    "published_year": "2019",
    "received_date": null,
    "accepted_date": null,
    "volume": "9",
    "issue": null,
    "page_first": "363",
    "page_last": "372",
    "article_number": null,
    "conference": {
        "short_name": "ISAS WINTER-2019 (ENS)",
        "full_title": "4th International Symposium on Innovative Approaches in Engineering and Natural Sciences",
        "name": "4th International Symposium on Innovative Approaches in Engineering and Natural Sciences",
        "acronym": "ISAS WINTER-2019 (ENS)",
        "location": "Samsun, Türkiye",
        "start_date": "2019-11-22",
        "end_date": null,
        "public_id": "ede2435c-3820-4bef-84a9-59e7d8de9d60"
    },
    "proceedings": {
        "title": "4th International Symposium on Innovative Approaches in Engineering and Natural Sciences",
        "series_title": "SETSCI Conference Proceedings",
        "publisher": "SET Technology",
        "isbn": "978-605-81988-8-3",
        "eisbn": null,
        "issn": null,
        "eissn": "2687-5527",
        "doi": null,
        "doi_prefix": "10.36287",
        "slug": "setsci-volume-9-2019-legacy-84",
        "public_id": "5d3c128d-5090-429f-8398-4e32c57e5584",
        "url": "https://www.set-science.com/p/setsci-volume-9-2019-legacy-84"
    },
    "license": {
        "name": "CC BY 4.0",
        "url": "https://creativecommons.org/licenses/by/4.0/",
        "code": "CC-BY-4.0",
        "open_access": true
    },
    "copyright": {
        "holder": "SET Technology",
        "year": "2019"
    },
    "funding_statement": null,
    "funders": [],
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    "credit": [],
    "history": {
        "published": "2019-12-22"
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}