FACULTAD DE INGENIERIA, ARQUITECTURA Y URBANISMO ESCUELA DE INGENIERIA CIVIL __________________ ___________________________ __________________ _________________ __________________ ___________________ ___________________ _________________ _______
PROYECTO DE INVESTIGACION
DEMOSTRACION DEL FLUJO LAMINAR EMPLEANDO EL EQUIPO DE OSBORNE REYNOLDS. __________________ ___________________________ ___________________ _________________ _________________ ___________________ ___________________ _________________ _______
MECANICA DE FLUIDOS II AUTOR LOBATON REGALADO,
Luis Ángel
PIMENTEL, 23 DE MAYO DEL 2014
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DEDICATORIA
A mi padre fallecido, Que mientras vivió fue un apoyo incondicional en mis estudios. A pesar de nuestra distancia física, siento que estás conmigo siempre. A mi madre que además de darme la vida ha estado siempre pendiente de mis luchas diarias. A mi Dios quién supo guiarme por el buen camino, darme fuerzas para seguir adelante y no desmayar en los problemas que se presentaban, enseñándome a encarar las adversidades sin perder nunca la dignidad ni desfallecer en el intento. A mi novia Guiselly quien me apoyo y alentó para continuar, cuando parecía que me iba a rendir.
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AGRADECIMIENTO
El presente trabajo de investigación fue realizado bajo la supervisión del Ing. Guillermo Gustavo Arriola carrasco, a quien me gustaría expresarle mi más profundo agradecimiento, por hacer posible la realización de esta investigación. Además, de agradecer su paciencia, tiempo y dedicatoria que tuvo para que esto saliera de manera exitosa. A la facultad de ingeniería civil de la universidad señor de Sipán, por permitirme el uso de su laboratorio de hidráulica para el desarrollo de esta investigación.
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RESUMEN El número de Reynolds es un número
adimensional utilizado en
mecánica de fluidos, en esta investigación demostraremos el flujo laminar empleando empleando el el equipo de
osborne Reynolds el cual debe ser
menor de 2300, dicha asignación del valor numérico para el flujo laminar fue reportado por primera vez por Osborne Reynolds en 1883, el cual estudió las características de flujo de los fluidos inyectando un trazador dentro de un líquido que fluía por una tubería. Para hacer posible esta demostración haremos uso del equipo de Reynolds (FME-06) que se encuentra en el laboratorio de hidráulica de la universidad señor de Sipán. De esta esta manera manera demostraremos demostraremos los valores valores dados dados por
Reynolds para
un flujo laminar.
Palabras claves: flujo laminar, número de Reynolds.
ABSTRACT The Reynolds number is a dimensionless number used in fluid mechanics, in this research demonstrate laminar flow using equipment Osborne Reynolds which must be less than 2300, such assignment of numerical value for laminar flow was first reported by Osborne Reynolds in 1883, which studied
the
characteristics of fluid flow by injecting a tracer into a fluid flowing through a pipe. To enable this demonstration we use the Reynolds team (FME06) located in the hydraulic laboratory of the Lord of Sipán university.
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ÍNDICE DEDICATORIA__________________________________________________ AGRADECIMIENTOS______________________________________________ RESÚMEN______________________________________________________ ÍNDICE_______________________________________________________ INTRODUCCIÓN_________________________________________________ CAPITULO I: PROBLEMA DE INVESTIGACION 1.1. SITUACIÓN PROBLEMÁTICA__________________________________ 1.2. FORMULACIÓN DEL PROBLEMA________________________________ 1.3. DELIMITACIÓN DE LA INVESTIGACIÓN________________________ 1.4. JUSTIFICACIÓN E IMPORTANCIA DE LA INVESTIGACIÓN_________ 1.5. LIMITACIONES DE LA INVESTIGACIÓN________________________ 1.6. OBJETIVOS DE LA INVESTIGACIÓN Objetivo General_____________________________________________ Objetivos Específicos________________________________________
CAPITULO II: MARCO TEORICO 2.1 ANTECEDENTES DE ESTUDIOS_________________________________ 2.2. BASE TEÓRICA CIENTÍFICAS________________________________ 2.3. DEFINICIÓN DE LA TERMINOLOGÍA (MARCO CONCEPTUAL)________
CAPÍTULO III: MARCO METODOLÓGICO 3.1. TIPO Y DISEÑO DE INVESTIGACIÓN__________________________ 3.2. POBLACIÓN Y MUESTRA_____________________________________ 3.3. HIPÓTESIS_______________________________________________ 3.4. OPERACIONALIZACIÓN______________________________________ 3.5. MÉTODOS, TÉCNICAS E INSTRUMENTOS DE RECOLECCIÓN DE DATOS
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CAPÍTULO IV: ANÁLISIS E INTERPRETACIÓN DE LOS RESULTADOS 4.1. RESULTADOS EN TABLAS Y GRÁFICOS_________________________ 4.2. DISCUSIÓN DE RESULTADOS_________________________________
CAPÍTULO V: CONCLUSIONES Y RECOMENDACIONES 5.1. CONCLUSIONES Y RECOMENDACIONES__________________________
CAPÍTULO VI: CONCLUSIONES Y RECOMENDACIONES 6.1. CONCLUSIONES____________________________________________ 6.2. RECOMENDACIONES_________________________________________
REFERENCIAS BIBLIOGRÁFICAS___________________________________ ANEXOS PANEL FOTOGRAFICO_____________________________________
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INTRODUCCIÓN Los diferentes regímenes de flujo y la asignación de valores numéricos de cada uno fueron reportados por primera vez por Osborne Reynolds en 1883 , el cual estudió las características de flujo de los fluidos inyectando un trazador dentro de un líquido que fluía por una tubería. A velocidades bajas del fluido, se ve que el movimiento tiene un carácter laminar. Sin embargo cuando hay mayores velocidades, el flujo del fluido se desorganizan obteniendo así un flujo turbulento. Para medir el parámetro usamos el número de Reynolds, el cual es un número adimensional que se utiliza para definir las características del flujo dentro de una tubería. El presente trabajo de investigación se realizara en el laboratorio de hidráulica de la Universidad Señor de Sipán, y se
trabajará
con
el
equipo
Osborne
Reynolds,
donde
se
demostrara el flujo laminar con valores menores de 2300. Mediante la toma de datos experimentales, se obtendrán por medio
del
uso
de
fórmulas
resultados
los
cuales
serán
procesados mediantes tablas y gráficos con la finalidad de observar el comportamiento del fluido a diferentes caudales.
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CAPITULO I: PROBLEMA DE INVESTIGACION
1.1. SITUACIÓN PROBLEMÁTICA Flujo laminar se denomina al movimiento de un fluido cuando éste es ordenado, estratificado, suave. En un flujo laminar el fluido se mueve en láminas paralelas sin entremezclarse y cada partícula de fluido sigue una trayectoria suave, llamada línea de corriente. En flujos laminares el mecanismo de transporte
lateral
es
exclusivamente
molecular.
Se
puede
presentar en las duchas eléctricas vemos que tienen líneas paralelas.
El
flujo
laminar
es
típico
de
fluidos
a
velocidades bajas o viscosidades altas, mientras fluidos de viscosidad baja, velocidad alta o grandes caudales suelen ser turbulentos El número de Reynolds es un parámetro adimensional importante en las ecuaciones que describen en qué condiciones el flujo será laminar o turbulento. En el caso de fluido que se mueve en un tubo de sección circular, el flujo persistente será laminar
por
debajo
de
un
número
de
Reynolds
crítico
de
aproximadamente de 2300.Para números de Reynolds más altos
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1.3. DELIMITACIÓN DE LA INVESTIGACIÓN Al tratar de demostrar un tipo de flujo laminar se usara un equipo de Osborne de
ingeniería
Reynolds (FME-6) de la escuela profesional
civil
de
la
universidad
señor
Sipán
y
se
realizara en el presente semestre académico.
1.4. JUSTIFICACIÓN E IMPORTANCIA DE LA INVESTIGACIÓN El aporte y la importancia que tendrá este trabajo será la demostración del Experimento de Osborne Reynolds, de forma visual y analítica para un flujo laminar con valores menores de 2300.Para ello, se realizaron pruebas de laboratorio con caudales diferentes. Este
Trabajo
Especial
de
Pregrado
es
un
aporte
para
la
carrera y la universidad por su gran valor académico y por qué existen pocas investigaciones sobre este tipo. De igual forma, los resultados de esta investigación permiten que los estudiantes del curso de fluidos 2, fortalezcan sus conocimientos sobre el número de Reynolds para un flujo laminar.
1.5. LIMITACIONES DE LA INVESTIGACIÓN
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1.6. OBJETIVOS DE LA INVESTIGACIÓN Objetivo General. Demostrar a través del equipo de Reynolds un flujo laminar con valores menores a 2300.
Objetivos Específicos.
Seleccionar
los
métodos
y
técnicas
necesarias
para
estudiar el flujo laminar
Analizar los métodos y técnicas para demostrar un flujo laminar con el uso del equipo de Reynolds.
Evaluar
en
demostración
base de
un
a
los
flujo
resultados laminar
con
obtenidos
la
el
de
equipo
Reynolds.
Proponer en función a los resultados los parámetros para obtener un flujo laminar.
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CAPITULO II: MARCO TEORICO 2.1 ANTECEDENTES DE ESTUDIOS No existe ninguna investigación a nivel local y nacional sobre la demostración del flujo laminar con el equipo de Reynolds.
Solo Se ha Reportado a nivel internacional la siguiente investigación: Tema: Diseño y montaje del equipo hidráulico para el ensayo del laboratorio descarga.
del
número
de
Reynolds
y
orificios
de
Autor: Umeimar Ramiro Urrea Toledo Año: 2012 Objetivo de la investigación: Diseño y montaje del equipo hidráulico para el ensayo del laboratorio del número de Reynolds y Comprobar si las características del flujo son de acuerdo a su tipo, por medio del sistema diseñado.
El cual concluye en: Realizado el experimento de Reynolds con anilina mineral se puede observar experimentalmente el tipo de flujo que pasaba por el tubo de acrílico, se hizo las respectivas
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2.2. BASE TEÓRICA CIENTÍFICAS FLUJO LAMINAR Es uno de los dos tipos principales de flujo en fluido. Se llama flujo laminar o corriente laminar, al movimiento de un fluido cuando éste es ordenado, estratificado, suave. En un flujo laminar el fluido se mueve en láminas paralelas sin entremezclarse
y
cada
partícula
de
fluido
sigue
una
trayectoria suave, llamada línea de corriente. En flujos laminares
el
mecanismo
de
transporte
lateral
es
exclusivamente molecular. Se puede presentar en las duchas eléctricas vemos que tienen líneas paralelas.
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laminar
a
turbulento
es
en
general
sensible
a
ruido
e
imperfecciones en el sistema. El perfil laminar de velocidades en una tubería tiene forma de una parábola, donde la velocidad máxima se encuentra en el eje del tubo y la velocidad es igual a cero en la pared del tubo. En este caso, la pérdida de energía es proporcional a la velocidad media, mucho menor que en el caso de flujo turbulento.
.
Flujo laminar de un fluido perfecto
Distribución de velocidades en un
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EL NUMERO DE REYNOLDS El
número
densidad,
de
Reynolds
relaciona
viscosidad,
velocidad
la y
dimensión típica de un flujo en una expresión adimensional, que interviene en numerosos problemas de dinámica de fluidos.
Dicho
número
o
combinación
adimensional aparece en muchos casos relacionado con el hecho de que el flujo pueda considerarse laminar (número de Reynolds pequeño) o turbulento (número de Reynolds grande). Para un fluido que circula por el interior de una tubería circular recta, el número de Reynolds viene dado por:
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LABORATORIO DEMOSTRACION DEL FLUJO LAMINAR EMPLEANDO EL EQUIPO DE REYNOLDS. EQUIPOS A UTILIZAR 1. BANCO HIDRÁULICO Es un equipo para el estudio del
comportamiento
de
los
fluidos, la teoría hidráulica y
las
propiedades
mecánica Compuesto hidráulico
de
de
fluidos.
por móvil
un
la Está
banco que
se
utiliza para acomodar una amplia variedad de módulos, que permiten al estudiante experimentar los problemas que plantea la mecánica de fluidos.
Partes
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2. EQUIPO OSBORNE REYNOLDS (FME-06) El
módulo
consiste
en
un
depósito
cilíndrico dotado de una tobera acoplada a un tubo de metacrilato, que permite la visualización del fluido. Un del
rebosadero caudal
y
garantiza una
aguja
la
homogeneidad
acoplada
a
un
depósito suministra el colorante. El agua se suministra desde el Banco Hidráulico (FME00)
o
el
Grupo
de
Alimentación
Hidráulica Básico (FME00/B). La
visualización
del
régimen
laminar
o
turbulento se puede realizar actuando sobre la válvula de control de flujo.
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5. REACTIVO Liquido un poco viscoso para poder identificar el tipo de flujo que corre en un determinado caudal.
6. TERMÓMETRO Aparato
que
temperatura, determinar
su
según tabla.
sirve del
para agua
viscosidad
medir y
la
poder
cinemática
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caudal no lo controlaríamos desde la perilla o válvula del tanque hidráulico, si no desde el mimo FEM-06. 5. Una vez el FEM-06 estaba lleno, se procedió a abrir la válvula para liberar el colorante, lo cual nos permitió observar el flujo del agua. 6. Se
procedió
medición
de
a
hacer
caudales
lo
mismo
bajos,
que
con
hicimos
una
para
probeta
y
la la
manguera, con la diferencia que ahora la manguera era la de salida de agua del FEM-06 (el caudal se controlaba con el FEM-06 o Módulo de demostración de Osborne-
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CAPÍTULO III: MARCO METODOLÓGICO 3.1. TIPO Y DISEÑO DE INVESTIGACIÓN Investigación
cuasi-experimental: está
integrada
por
un
conjunto de actividades teóricas, metódicas y técnicas que se realizan para recabar la información y datos necesarios sobre el tema a investigar y el problema a resolver.
3.2. POBLACIÓN Y MUESTRA
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Velocidad
Diámetro de la tubería
Temperatura
viscosidad
3.5. MÉTODOS, TÉCNICAS E INSTRUMENTOS DE RECOLECCIÓN DE DATOS
Aplicación de fórmulas
actuales para el cálculo del
número de Reynolds.
Utilización del equipo de Osborne Reynolds(FME-069)
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CAPÍTULO IV: ANÁLISIS E INTERPRETACIÓN DE LOS RESULTADOS 4.1. RESULTADOS EN TABLAS Y GRÁFICOS. DATOS Datos obtenidos en el Equipo de Osborne Reynolds.
Temperatura del Agua: 32 °C
Diámetro de la tubería: 10 mm. = 0.01 m.
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Antes
de
exponer
los
describir
algunas
expresiones
práctica.
resultados
obtenidos,
matemáticas
es
usadas
necesario en
esta
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RESULTADOS Al
aplicar
las
ecuaciones
descritas
anteriormente,
se
obtuvieron los resultados para cada experiencia. Los mismos
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En el grafico podemos apreciar que cuando va aumentando el caudal lo mismo sucede con el número de Reynolds. GRAFICO N°2
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4.2. DISCUSIÓN DE RESULTADOS. Es la autoevaluación de los procedimientos empleados y discusión de los posibles alcances y significados de la
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CAPÍTULO V: PROPUESTA DE INVESTIGACIÓN ECUACIÓN EXPLÍCITA PARA EL CÁLCULO DE FACTORES DE FRICCIÓN
“
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