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- W2023228841 abstract "The problem of laminar forced convective heat transfer from an isothermal circular cylinder rotating about its own axis and placed in a uniform stream is considered. The direction of the forced flow of the cooling fluid is assumed to be normal to the cylinder axis. The study is based on the solution of the unsteady two-dimensional conservation equations of mass, momentum and energy. The problem is solved for Reynolds number (based on the free stream velocity) up to Re = 100 and for velocity ratios (ratio between cylinder circumferential velocity and free stream velocity) up to α = 4. Major emphasis is given to the effect of the speed of rotation on the thermal boundary layer geometry and also on the local Nusselt number distribution. On considère le problème du transfert thermique par convection laminaire forcée autour d'un cylindre tournant autour de son axe et placé dans un courant uniforme. La direction de l'écoulement forcé du fluide refroidissant est normal à l'axe du cylindre. L'étude est basée sur la solution des équations de bilan, en régime variable bidimensionel, de masse, de quantité de mouvement et d'énergie. Le problème est résolu pour un nombre de Reynolds (basé sur la vitesse au loin) allant jusqu'à Re = 100 et pour des rapports de vitesse (rapport de la vitesse circonférentielle du cylindre à la vitesse du courant) allant jusqu'à α = 4. Un intérêt particulier est porté à l'effet de la vitesse de rotation sur la géométrie de la couche limite thermique et aussi sur la distribution du nombre de Nusselt local. Das Problem der Wärmeübertragung bei laminarer erzwungener Konvektion an einem isothermen kreisförmigen Zylinder wird betrachtet, welcher sich um seine eigene Achse dreht und sich in einer gleichförmigen, quergerichteten Strömung befindet. Die Untersuchung beruht auf der Lösung der instationären zweidimensionalen Erhaltungsgleichungen für Masse, Impuls und Energie. Das Problem wurde für Reynolds-Zahlen (gebildet mit der freien Strömungsgeschwindigkeit) bis zu Re = 100 und für Geschwindigkeitsverhältnisse (Verhältnis zwischen Zylinderumfangsgeschwindigkeit und freier Strömungsgeschwindigkeit) bis zu α = 4 gelöst. Besondere Aufmerksamkeit wurde dem Einfluβ der Rotationsgeschwindigkeit auf die Geometrie der thermischen Grenzschicht und auf die Verteilung der örtlichen Nusselt-Zahl verwandt. Paccмaтpивaeтcя зaдaчa o лaминapнoм вынyждeннoм кoнвeктивнoм тeплoпepeнoce oт изoтepмичecкoгo кpyглoгo цилиндpa, вpaщaюшeгocя вoкpyг coбcтвeннoй ocи и пoмeщeннoгo в oднopoдный пoтoк жкидкocти. Пpeдпoлaгaeтcя, чтo вынyжлeнный пoтoк oчдaждaющeй жидкocти нaпpaвлeн пepпeндикyляpнo к ocи цилиндpa. Иccлeлoвaниe пpoвoлитcя нa ocнoвe peшeния нecтaциoнapныч двyмepныч ypaвнeний coчpaнeния мaccы, импyльca и знepгии. эaлaчa peшaeтcя для знaчeний чиcлa Peйнoльдca (вычиcляeмoгo пo cкopocти нeвoзмyщeннoгo пoтoкa) вплoть дo Re = 100 и oтнoшeния cкopocтeй (oтнoцшeниe oкpyжнoй cкopocти цилиндpa к cкopocти нeвoзмyщeннoгo пoтoкa) вплoть дo α = 4. Ocнoвнoe внимaниe yдeлeнo иccлeдoвaнию влияния cкopocти вpaщeния цилиндpa нa гeoмeтpию тeплoвoгo пoгpaничнoгo cлoя, a тaкжe нa pacпpeдeлeниe лoкaльныч чиceл Hycceльтa." @default.
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- W2023228841 date "1985-01-01" @default.
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- W2023228841 title "Laminar forced convection from a rotating cylinder" @default.
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