Fluid Dynamics vs Fluid Mechanics
Cov dej muaj zog thiab cov tshuab ua kua dej yog ob qho tseem ceeb ntawm kev kawm hauv physics. Cov kev kawm no tseem ceeb heev thaum nws los txog rau cov kev kawm xws li kev tsim kho aeronautic, nautical engineering, civil thiab tub rog engineering, thiab ntau yam kev kawm. Fluid mechanics thiab fluid dynamics tuaj yeem raug coj los ua ib qho chaw tshiab ntawm cov tshuab qub qub uas qhov tshwm sim thiab cov thermodynamics ua lub luag haujlwm tseem ceeb heev. Yuav kom nkag siab tag nrho cov yam ntxwv ntawm cov dej mechanics thiab dej dynamics, ib tug yuav tsum muaj kev paub zoo hauv kev txuag hluav taws xob, vector fields, thiab txawm tias qhov ntsuas kub kub. Hauv tsab xov xwm no, peb yuav tham txog dab tsi cov dej mechanics thiab dej dynamics yog, lawv cov hauv paus ntsiab lus tsim, zoo sib xws, kev siv, thiab thaum kawg lawv qhov sib txawv.
Fluid Mechanics
Ib lub kua yog txhais tau tias yog roj lossis kua. Fluid mechanics yog kev kawm txog tus cwj pwm ntawm cov kua thiab gasses. Kev txhais kom raug dej mechanics ntau dua yog kev kawm txog cov kua thiab lub zog ntawm lawv. Fluid mechanics muaj peb yam tseem ceeb. Lawv yog cov kua dej statics uas kawm txog cov kua dej thaum so, kua kinematics uas kawm txog kev txav ntawm cov kua, thiab cov dej dynamics uas kawm txog cov teebmeem ntawm cov rog ntawm cov dej txav. Tab sis raws li peb paub, kua thiab gasses tsis muaj lub xeev khov kho. Muaj ib txwm muaj kev txav mus los vim qhov thermal agitation ntawm gasses thiab kua. Txawm li cas los xij, thermal agitation ntawm gasses yog siab dua li cov kua. Ib tug ntawm cov founders ntawm cov dej mechanics yog Archimedes. Nws lub ntsiab lus buoyancy nto moo yog ib lub hauv paus ntsiab lus tseem ceeb hauv cov tshuab ua kua dej. Tom qab ntawd, cov kws tshawb fawb tseem ceeb xws li Leonardo da Vinci, Evangelista Torricelli, Isaac Newton, Blaise Pascal, Daniel Bernoulli thiab cov kws ua lej tseem ceeb xws li Euler, d'Alembert, Lagrange, Poisson thiab Laplace tau ua rau muaj txiaj ntsig zoo rau kev kawm txog cov tshuab ua kua dej. Lub teb ntawm viscosity yog tom qab tsim los ntawm Poiseuille, Hagen, Navier thiab Stokes.
Fluid Dynamics
Fluid dynamics is a sub field of fluid mechanics. Fluid dynamics kawm txog qhov cuam tshuam ntawm lub zog ntawm cov dej txav. Qhov sib npaug tseem ceeb tshaj plaws hauv cov dej muaj zog yog Bernoulli qhov sib npaug, uas tau hais los ntawm Daniel Bernoulli. Nws txhais tau hais tias rau ib qho incompressible, inviscid kua ntawm ib tug khov kho thiab tsis-turbulent flow. Rau cov kua dej zoo li no, qhov kev suav ntawm hydrostatic siab, lub zog kinetic ib chav tsev ntim thiab lub peev xwm lub zog ntawm ib chav tsev ntim yog qhov tas li. Qhov no tuaj yeem siv rau txhua txoj kab uas tsis txaus ntseeg hauv cov kua dej. Txawm li cas los xij, cov kua dej hauv qhov tiag tsis ua raws li qhov sib npaug no vim tias lawv yog compressible thiab viscous. Lwm qhov kev sib npaug tseem ceeb ntawm cov dej muaj zog yog Navier-Stokes equations thiab Reynolds thauj theorem. Cov no yog cov kev txuag loj, kev txuag hluav taws xob thiab kev txuag hluav taws xob hauv ntau hom. Ib qho tseem ceeb ntawm cov dej dynamics yog aerodynamics. Cov dav hlau siv Bernoulli theorem los tsim kom muaj qhov sib txawv ntawm qhov siab thiab qis ntawm tis. Qhov no ua rau ya tau. Hydrodynamics kuj tseem ua ib feem tseem ceeb hauv lub neej txhua hnub.
Qhov txawv ntawm Fluid Mechanics thiab Fluid Dynamics yog dab tsi?
• Fluid mechanics kawm cov kua hauv lub xeev zoo li qub lossis lub cev muaj zog.
• Fluid dynamics is a sub section of fluid mechanics. Nws tsuas yog kawm txog qhov cuam tshuam ntawm lub zog ntawm cov dej txav.
