NUMERICAL SIMULATION OF FLOW AND HEAT TRANSFER CHARACTERISTICS OUTSIDE A PERIODICALLY VIBRATING TUBE-中国Betway体育网页登陆

摘要 Fluidflowandheattransfercharacteristicsoutsideavibratingtubewerenumericallysimulatedbythedynamicmeshmethod.Themechanismofheattransferenhancementviaperiodicvibrationofthetubewasexploredbyusingthefieldsynergyprinciple.Itisfoundthatthefieldsynergyanglebetweenfluidvelocityvectorandtemperaturegradientvectorforaperiodicallyvibratingtubeissignificantlysmallerthanthatforastationarytube,anditchangesapproximatelyaccordingtothesinusoidallawinavibrationperiod.Theeffectoftimephaseofthevibrationonthefieldsynergyangleandconvectiveheattransfercoefficientwerealsodiscussed.Resultsindicatethatthevibrationcanenhanceheattransferandthiseffectismoreremarkablewhentimephaseanglerangesbetween50oand140oinahalfperiod.Especiallywhenthetimephaseangleis90o,theaveragefieldsynergyangleoutsidethetubereachestheminimum,whichleadstothebestheattransferperformance.

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NUMERICAL SIMULATION OF FLOW AND HEAT TRANSFER CHARACTERISTICS OUTSIDE A PERIODICALLY VIBRATING TUBE

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