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La facilidadconque unliquidose derramaesunaindicaciónde viscosidad.El aceite friotiene
una altaviscosidadyse derrama muylentamente,mientrasque el aguatiene unaviscosidad
relativamente gajayde derrama con bastante facilidad.Definimoslaviscosidadcomola
propiedadde unfluidoque ofrece resistenciaal movimientorelativode susmoléculas.La
perdidade energíadebidaala fricción enfluidoque fluyese debe asuviscosidad.
Viscosímetrocapilar
Los viscosímetroscapilaresde vidriode cannonfrenske,ubbelohde yostwaldsonlos
instrumentosmaspopulares basadosenel primerode losmétodosmecánicos.El conductoes
un capilarcilíndricoyla fuerzaque hace que el líquidofluyaa travésde él essu peso.
Viscosímetro de tuvooswald.Estosinstrumentosse describenenlasfarmacopeasysontema
de una especificaciónde lainternational standardsorganization.Existeunagranvariedad
variedadde capilaresde distintoscalibresy se debe seleccionarunoapropiadoparaconseguir
un tiempode fluidode 200s,aproximadamente;porconsiguiente,paraconseguienteparalos
fluidosmasviscososse empleanlosviscosímetrosde mayorcalibre .para losfluidosque
tienenunaespecificación de laviscosidadenlaBP,se establece el tamañoque debe usarse
para determinarsuviscosidad.
En la figura4.5 puede verse el instrumento;el flujoatravésdel capilarse produce por efecto
de la gravedad.La velocidadmáximade deslizamientodeslizamiento, Ym,vienedada por:
Donde ρ es la densidaddelfluido g es la aceleración debida a la gravedad rc es elradiodelcapilary η la viscosidad absoluta. Por
consiguiente, para un fluido de1 mPa.S de viscosidad la velocidad máxima dedeslizamiento es aproximadamente2 x 10 2
𝑠−1
para un fluido con una viscosidadde 1.490 mPa, s siel capilar tiene undiámetro.De 0,64 mmpero será delorden de 10 2
𝑠−1
para un fluido con una viscosidadde 1.490 mPa/s si el capilar tiene diámetro de2,74 mm.
El liquido se introduceen el viscosímetro hasta la marca G atraves del brazo V, utilizando una pipeta bastantelarga para envitar
que se mojenlos lados deltubo a continuaciónsesujeta verticalmente el tubo dentro deunbaño deagua a temperatura
constantey sepermitequealcancela temperatura necesaria. Se ajusta el
Nivel del tubo w hasta queel meniscosesitua justoencima de la marca E. Se mideel tiempo necesariopara queelmenisco
descienda entre las marcas Ey F se debenrepetirlas determinaciones hasta obtener tres lecturas conun margen de0.5 s. deben
extremarselas precauciones para no introducirburbujas deairey evitar que el capilarquede ocluido parcialmente para particular
de pequeño tamaño.

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La facilidad con que un liquido se derrama es una indicación de viscosidad

  • 1. La facilidadconque unliquidose derramaesunaindicaciónde viscosidad.El aceite friotiene una altaviscosidadyse derrama muylentamente,mientrasque el aguatiene unaviscosidad relativamente gajayde derrama con bastante facilidad.Definimoslaviscosidadcomola propiedadde unfluidoque ofrece resistenciaal movimientorelativode susmoléculas.La perdidade energíadebidaala fricción enfluidoque fluyese debe asuviscosidad. Viscosímetrocapilar Los viscosímetroscapilaresde vidriode cannonfrenske,ubbelohde yostwaldsonlos instrumentosmaspopulares basadosenel primerode losmétodosmecánicos.El conductoes un capilarcilíndricoyla fuerzaque hace que el líquidofluyaa travésde él essu peso.
  • 2. Viscosímetro de tuvooswald.Estosinstrumentosse describenenlasfarmacopeasysontema de una especificaciónde lainternational standardsorganization.Existeunagranvariedad variedadde capilaresde distintoscalibresy se debe seleccionarunoapropiadoparaconseguir un tiempode fluidode 200s,aproximadamente;porconsiguiente,paraconseguienteparalos fluidosmasviscososse empleanlosviscosímetrosde mayorcalibre .para losfluidosque tienenunaespecificación de laviscosidadenlaBP,se establece el tamañoque debe usarse para determinarsuviscosidad. En la figura4.5 puede verse el instrumento;el flujoatravésdel capilarse produce por efecto de la gravedad.La velocidadmáximade deslizamientodeslizamiento, Ym,vienedada por: Donde ρ es la densidaddelfluido g es la aceleración debida a la gravedad rc es elradiodelcapilary η la viscosidad absoluta. Por consiguiente, para un fluido de1 mPa.S de viscosidad la velocidad máxima dedeslizamiento es aproximadamente2 x 10 2 𝑠−1 para un fluido con una viscosidadde 1.490 mPa, s siel capilar tiene undiámetro.De 0,64 mmpero será delorden de 10 2 𝑠−1 para un fluido con una viscosidadde 1.490 mPa/s si el capilar tiene diámetro de2,74 mm.
  • 3. El liquido se introduceen el viscosímetro hasta la marca G atraves del brazo V, utilizando una pipeta bastantelarga para envitar que se mojenlos lados deltubo a continuaciónsesujeta verticalmente el tubo dentro deunbaño deagua a temperatura constantey sepermitequealcancela temperatura necesaria. Se ajusta el Nivel del tubo w hasta queel meniscosesitua justoencima de la marca E. Se mideel tiempo necesariopara queelmenisco descienda entre las marcas Ey F se debenrepetirlas determinaciones hasta obtener tres lecturas conun margen de0.5 s. deben extremarselas precauciones para no introducirburbujas deairey evitar que el capilarquede ocluido parcialmente para particular de pequeño tamaño.