UNIVERSID UNIVERSIDAD AD NACION NACIONAL AL SAN CRISTÓB CRISTÓBAL AL DE HUAMAN HUAMANGA GA
UNSCH
LABORATORIO MECÁNICA ME CÁNICA DE FLUID FLUIDOS OS
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UNIVERSIDAD NACIONAL SAN CRISTOBAL DE HUAMANGA A C U LT LTA AD F AC
DE I NGENIER ´ IA DE
M INAS G EOLOG´I A
Y C IVIL
´ N P ROFESIONAL DE I NGENIER ´IA C IVIL E SCUELA DE F ORMACI ON O
´ CANICA DE FLUIDOS LABORATORIO DE MECANICA E (IC-338)
PRACTICA DE LABORATORIO N°01 ´ PRADO Docente: Ing. Docente: Ing. Jaime Leonardo BENDEZU Integrantes:
´ Jos´ ´ Luis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Co CANDIA ROM AN, Jose Cod.(16161211) HUARCAYA CONGACHA, Jhon Tonny . Tonny . . . . . . . . . . . . . . . . . . . . . . . . . . . . Co Cod.(16147308) SIMBRON GASGA, Howard Howard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Co C od.(16162501) SOTO MENDEZ, Frank Frank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C o d . ( 1 6 1 6 2 7 0 1 ) ´ Jhon Arnold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C o d . ( 1 6 1 6 1 2 0 0 ) TORRES GASTELU, ´ AYACUCHO AYACUCHO PER U
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
´Indice Indice 1. TRAYECTORI TRAYECTORIA A DE UN CHORRO CHORRO LIBRE LIBRE 1.1. Introducci Introducci´ on: o ´n: . . . . . . . . . . . . 1.2. Objetivos: Objetivos: . . . . . . . . . . . . . . 1.3.. Descri 1.3 Descripci pci´ on o ´n del equipo: . . . . . . ´ 1.3.1. 1.3 .1. Datos Datos tecnicos: ecnicos: . . . . . . . 1.4. Equipos Equipos empleados empleados en el ensayo: ensayo: .
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3 3 3 3 4 4
2. Generalidades Generalidades.. 2.1. PRUEBA 1: Determin Determinaci aci´ o on ´n del coeficiente de velocidad de la trayectoria del chorro. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ´n del coeficiente de descarga bajo carga constante 2.2. PRUEBA 2: Determin Determinaci aci´ o on 2.3.. PRUEBA 2.3 PRUEBA 3: Determina Determinaci ci´ o on ´n del coeficiente de descarga bajo carga variable ´n) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (en disminuci´ disminucion) o
4
3. Procedimient Procedimiento o Experiment Experimental. al. 3.1. Procedimien Procedimiento to experimental experimental para para la prueba prueba 1. . . . . . . . . . . . . . . . . . 3.2. Procedimien Procedimiento to experimental experimental para para la prueba prueba 2. . . . . . . . . . . . . . . . . . 3.3. Procedimien Procedimiento to experimental experimental para para la prueba prueba 3. . . . . . . . . . . . . . . . . .
6 6 13 15
˜ os de Comprensi´ ´ n. 4. Dese Desemp mpe enos n Comprension. o
18
5. Conclu Conclusion siones. es.
19
6. Bibliograf Bibliog raf´ ´ıa.
19
4 5 6
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
1. 1.1. 1.1.
TRAYEC TRAYECTOR TORIA IA DE UN CHORR CHORRO O LIBR LIBRE E ´ n: Intr Introd oduc ucci ci´ on: o
´n de la gravedad Un chorro libre en el aire describe una trayectoria, o camino bajo la acci on o con una componente vertical de velocidad continuamente variable. La trayectoria es una ´n del aire, puede aplicarse el l´ınea de corriente y por consecuencia, despreciando la presi on o Teorema BERNOULLI, con todos los t´ terminos ´ erminos de presi´ presion o ´ n nulos. Luego la suma de la ele vaci´ on y la columna de presi´on on on deben ser constantes en todos los puntos de la curva. El gradiente de energ´ energ´ıa es una recta horizontal a una altura V2/2g sobre la tobera, siendo la velocidad de salida del orificio o tobera. El chorro que parte del orificio describe una par ´ abola debido al efecto de la gravedad, abola despreciando la resistencia del aire este experimento puede dejar relaciones interesantes entre lo real y lo te´ teorico, o ´rico, aplicando los fundamentos cient´ cient´ıficos correspondientes.
1.2. 1.2.
Obje Objeti tivo vos: s: Determinar el coeficiente de velocidad del orificio. Determinar Determinar el coeficiente coeficiente de descarga descarga bajo carga constante. constante. Determinar el coeficiente de descarga bajo carga variando.
1.3. 1.3.
´ n del equipo: Desc Descri ripc pciion o
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos ´cnicos: 1.3. 1.3.1. 1. Dato Datoss tecnicos: e Las siguientes dimensiones del equipo son usadas en los c´ calculos a ´lculos apropiados: Di´ Diametro a ´metro del orificio peque˜ peque no n ˜ o 0.003m ´metro del orificio Di´ Diametro a orificio grande 0.006m ´ Area superficial del dep´ deposito o ´sito 1.812E-m2
1.4. Equipos Equipos empleado empleadoss en el ensayo: ensayo: Banco hidr´ hidraulico a ´ulico F1-10. El aparato de chorro y orificio F1-17. ´metro. Un cron´ cronometro. o
2. Gene Genera rali lida dade des. s. Midiendo la trayectoria de un chorro saliendo de un orificio en el costado de un dep osito o ´sito bajo condiciones de flujo estables.
2.1. 2.1.
´ n del coeficiente de velocidad de la traPRUE PRUEBA BA 1: Deter Determin minaci aci´ o on yectoria del chorro.
De la aplicaci´ aplicacion o ´n de la ecuaci´ ecuaci on o ´n de Bernoulli (conservaci´ (conservacion o ´n de la energ´ energ´ıa mec´ mecanica a ´nica para un ´n e incompresible): flujo estable sin fricci´ friccion o La velocidad ideal del flujo del orificio en una vena contractada de un chorro (di ametro ´ ametro mas ´ as estrecho) es: ´ n 1: V i = Ecuaci´ Ecuacion o
2g h
Donde h es la altura del fluido encima del orificio. La velocidad real es:
´ n 2: V = C v 2g h Ecuaci´ Ecuacion o
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos horizontal viajada. ´ n 3: x = x = v vtt Ecuaci´ Ecuacion o ´n de gravedad, el fluido tambi´ Porque la acci´ accion o tambi ´ en adquiere una componente vertical hacia en debajo debajo de la velocidad (direcci´ (direccion o ´n en y) por consiguiente despu´ despu ´ es del mismo tiempo, t, (es es decir despu´ despu´ es de viajar una distancia x) el chorro tendr´ es tendr ´ a un desplazamiento y dado por 2
´ n 4: y = y = g g t2 Ecuaci´ Ecuacion o
El cual puede ser despejado para dar ´ n 5: t = t = Ecuaci´ Ecuacion o
y
2 g
´ n por t de 5 a 3 y por v de 3 a 2 produce en resultado. Sustituci´ Sustitucion o
C v =
x √ 2 yh
Por consiguiente para condiciones de flujo estable, es decir h constante, el C v puede ser determinado desde las coordenadas del chorro x,y. Una gr´ gr afica a ´fica de x trazada contra y h0,5 dar´ a una pendiente 2C 2 C v .
2.2. 2.2.
´ n del coeficiente de descarga bajo carga PRUE PRUEBA BA 2: Deter Determin minac aciion o constante
´n de la ecuaci´ ´n de Bernoulli (conservaci´ ´n de la energ´ ´nica para un De la aplicaci´ aplicacion o ecuaci on o (conservacion o energ´ıa mec´ mecanica a flujo estable sin fricci´ friccion o ´n e incompresible): La velocidad ideal del flujo del orificio en una vena contracta de un chorro (di ametro ´ ametro m´ mas a ´s estrecho) es:
V i =
2g h
Donde h es la altura del fluido encima del orificio. ´ n 6: Q t = v Ecuaci´ Ecuacion o = vi × Ao El caudal real del chorro est´ est a ´ definido por: ´ n 7: Q Ecuaci´ Ecuacion o
V / t
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos ´n transversal de la vena contracta dada por: Donde: A c es el ´ el ´area area de la secci´ seccion o
Ac = C = C c A0 ´ n y por lo tanto, C c < 1 < 1 Donde: A 0 es el ´ el ´area area del orificio y es el coeficiente de contracci´ contracci on o Por consiguiente
´ n 9: Q r = C Ecuaci´ Ecuacion o = C c A0 C v 2g h El producto de C c C v , es llamado el coeficiente de descarga C d , para finalmente
Qr = C = C d A0 2g h ´ fica de Q vs Si el es asumido constante, entonces la gr´ gr afica a √ S = C = C d A0 2g
2.3. 2.3.
√
h ser´ ser´ a lineal, y la pendiente,
´ n del coeficiente de descarga bajo carga PRUE PRUEBA BA 3: Deter Determin minac aciion o ´ n) variable (en disminuci´ disminucion) o
´ dado por: Para un flujo inestable, el tiempo t, para la carga a tirar desde h 1 hacia h est´ est a ´ n 11: t = t = Ecuaci´ Ecuacion o
2 Ar √ C d A0 2g
√
√
h1 − h
Donde A r es el ´ el ´area area de la secci´ seccion o ´n transversal del dep´ dep osito o ´ sito (incluyendo (incluyendo la camara ´ amara secundaria) Por lo tanto: C d =
√ √
Ar 2( h1 − h) √ Ao t ( 2g )
NOTA: Este NOTA: Este es un resultado aproximado, el cual no permite completamente para efectos
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos ´ una hoja de papel al tablero, entre las agujas y el tablero y se aseguraron 5. Se coloc´ coloco en su lugar con la prensa suministrada para que el borde superior est ´ e horizontal.
6. Se marc´ marco ´ la ubicaci´ ubicacion o ´n de la cima de cada aguja en el papel.
7. Se anot´ o la distancia horizontal desde el plano del orificio (tomado como x=0) al ´n de la primera aguja. Este primer punto punto de coordenada marcando la posici on o de coordenada coordenada deber´ deber´ıa estar lo suficiente suficiente cerca al orificio orificio para tratarlo como que tiene un valor de y=0. As´ As´ı que los desplazamientos “y” fueron medidos relativo a esta posici´ posicion. o ´n.
´ esta prueba para una carga baja en el reservorio. 8. Se repiti´ repitio
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
´ C ALCULOS: Para tabla 1 Hallamos la velocidad inicial
vinicial =
∗ ∗
2g H
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
t7 =
2(13, 2(13,2) = 1, 1,64seg 64seg 9,81m/ 81m/ss 2
Hallando el coeficiente de velocidad Cv
C v =
x √ 2 yh
C v 1 = C v 2 = .. . C v 7 =
0,0135m 0135m
2 (0m (0m)(0, )(0,3m) 0,0635m 0635m 2 (0, (0,013m 013m)(0, )(0,3m) 0,3135m 3135m
2 (0, (0,132m 132m)(0, )(0,3m)
= 0, 0,50
= 0, 0,79
Hallando velocidad V = C v 2g h
V = C v 2g h V 1 =?
V 2 = 0, 0 ,11 2(9, 2(9,81m/ 81m/ss 2)(0, )(0,3m) = 0, 0,27m/ 27m/ss .. .
V 7 = 0, 0 ,79 2(9, 2(9,81m/ 81m/ss 2)(0, )(0,3m) = 1, 1,92m/ 92m/ss
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
Siguiendo los mismos pasos tenemos para los dem´ dem ´ as datos los siguientes resultados Para la as
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
yh ) Grafica de (x ( x ∗ yh)
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
yh ) Grafica de (x ( x ∗ yh)
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
´ PROCEDIMIENTO DE C ALCULO
Qr = volumen tiempo 0,073lt 073lt s 0,012lt s / seg = 12 6,11seg 11seg = 0, 072Lts Qr 2 = 05,072Lts 0,013lt s / seg = 13 ,43seg 43seg = 0, Lts Qr 3 = 06,075 0,011lt s / seg = 11 ,35seg 35seg = 0, Lts Qr 4 = 06,072 0,011lt s / seg = 11 ,44seg 44seg = 0, Lts Qr 5 = 07,081 0,010lt s / seg = 10 ,86seg 86seg = 0, Lts Qr 6 = 0,078 0,011lt s / seg = 11 7seg = 0,
3
× 10−6 m / s × 10−6m / s × 10−6m / s × 10−6m / s × 10−6m / s × 10−6m / s
Qr 1 =
Q
V × A
3
3 3 3 3
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos Qr Qt 3 − 6 12×10 m / s 3 0,000069m / s 3 13×10−6 m / s 3 0,000072m / s 3 11×10−6 m / s 3 0,000064m / s 3 11×10−6 m / s 3 0,000063m / s 3 10×10−6 m / s 3 0,000062m / s 3 11×10−6 m / s 3 0,000062m / s
C d =
C d 1 = C d 2 = C d 3 = C d 4 = C d 5 = C d 6 =
= 0, 0,173 = 0, 0,179 = 0, 0,170 = 0, 0,174 = 0, 0,160 = 0, 0,177
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos 3. Toma lecturas de carga cayendo (h) en intervalos de 20 seg. Puedes encontrar el modo m´ mas ´ as f ´ acil de hacer esto, atando una pieza de masking tape inmediatamente adacil ´n yacente a la escala en el reservorio y en los intervalos 20segundos marque la posici´ posici on o de la carga correspondiente al tiempo conocido. 4. El procedimiento procedimiento de arriba arriba deber´ deber´ıa ser repetido para el segundo orificio. Datos obtenidos
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
√ √ √ × √ −√ √ × × √ −√ √ × × √ −√ √ × × √ −√ √ × × √ −√ √ × × √ √
356m− 0,349m 349m) ,812×10−2 m2 2×( 0,356m C d 8 = 71,0686 = 0, 0,6823 − 6 2 ×10 m 10s 10s 2×9,81m / s2
C d 9 =
1,812×10−2 m2 2 7,0686×10−6 m2
(
C d 10 =
1,812×10−2 m2 2 7,0686×10−6 m2
(
C d 11 =
1,812×10−2 m2 2 7,0686×10−6 m2
(
C d 12 =
1,812×10−2 m2 2 7,0686×10−6 m2
(
C d 13 =
1,812×10−2 m2 2 7,0686×10−6 m2
(
2
(
1 812 10−2
2
0,349m 349m
10s 10s
2 9,81m / s2
0,342m 342m
10s 10s
0,321m 321m)
2 9,81m / s2
0,321m 321m
10s 10s
0,329m 329m)
2 9,81m / s2
0,329m 329m
10s 10s
0,335m 335m)
2 9,81m / s2
0,335m 335m
10s 10s
0,342m 342m)
0,315m 315m)
2 9,81m / s2
0 315m 315m
0 308m 308m)
= 0, 0,6892 = 0, 0,6963 = 0, 0,6026 = 0, 0,8121 = 0, 0,6158
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
S4 =
× × × × × × × ×
1,812x10−2 7,069x10−6 ×0,7581
1,812x10−2 7,069x10−6 ×0,5739 x10−2 S6 = 7,0691,x812 − 10 6 ×0,6757 −2 S7 = , 1,x812−x610 7 069 10 ×0,6823 x10−2 S8 = 7,0691,x812 − 10 6 ×0,6892 x10−2 S9 = 7,0691,x812 − 10 6 ×0,6963 x10−2 S10 = 7,0691,x812 − 10 6 ×0,8026 x10−2 S11 = 7,0691,x812 − 10 6 ×0,8121
S5 =
2 9,81 =
1526, 1526,702
2 9,81 =
2016, 2016,715
2 9,81 =
1712, 1712,879
2 9,81 =
1696, 1696,310
2 9,81 =
1679, 1679,328
2 9,81 =
1662, 1662,204
2 9,81 =
1920, 1920,664
2 9,81 =
1425, 1425,185
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos S´ı porque el flujo posee este aspecto y que la persona debe de conocer, ya que como un valor que define cuando el fluido se descarga en un lapso de tiempo y a una velocidad conocida. ´ los Cd son valores significativamente menores que 1? que 2. ¿Por qu´ ´ ´ n del Porque el coeficiente de descarga es el coeficiente de las areas, areas, o sea la divisi´ divisi on o area a ´rea de la secci´ seccion o ´ n transversal y el ´ area del orificio multiplicado por dos veces la area ´ gravedad gravedad y tambi´ tambi´ en tomando en cuenta la p´ en perdida erdida de la carga. 3. Compare los valores de Cd obtenidos para las pruebas de carga constantes y ´ l valor es el resultado m´ ´s fiable? descendientes. descendientes. ¿Cu´ ¿Cual a m as a
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´nica de Fluidos Lab. Mec´ Mecanica a Fluidos
6.
Bibliograf ´ıa. Mec´ Mecanica a ´nica de Fluidos e Hidr´ Hidr aulica a ´ulica (Ronald V. Giles.) Gu´ Gu´ıa de Practicas de Hidr´ Hidr aulica a ´ulica I www.google.com