Hydraulic jump basins with wedge-shaped baffles

Ellayn, Ashraf Fathy; Sun, Zhilin

doi:10.1631/jzus.a1200037

Cited by 14 publications

(11 citation statements)

References 14 publications

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“…In order to show the amount of difference between the sequent depth of forced jump y2 and sequent depth of classical jump y2*, a dimensionless depth deficit parameter D was used. This parameter indicator was adopted previously by numerous researchers such as [8], [17], [26], [1], and [9] as given below:…”

Section: Resultsmentioning

confidence: 99%

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The performance of hydraulic jump over rough bed stilling basin consisting of cubic-shape elements

Maatooq

Taleb

2018

MATEC Web Conf.

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Abstract. Three groups of cubic roughness elements non-protruding to the flow were fixed with a specific configuration at the downstream of a stream lined lib sluice gate. The aim was to test the performance of the hydraulic jump under using such elements as appurtenances of stilling basin. The experimental works has been conducting to test; four different intensities, I=8%, 10%, 12% and 16%; three width to height ratios, We/he=0.75, 1.5 and 2; and three length to height ratios, Le/he=0.75, 2 and 4, of cubic elements made from waterproof stiff rubber. The test was performed under the incoming Froude number; F1 ranged between 2.7 to 9. After analysing the experimental data one from the second group configuration gives a higher reduction of sequent depth ratio, y2/y1 as compared with the depth ratio of the un-forced hydraulic jump which calculated by Belanger equation, this decreases arrived 20%. Also greater relative energy has been dissipated, and the gain in dissipation (%GED) ranged between 10.8-22.3%.

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Section: Resultsmentioning

confidence: 99%

“…The second is formed over the so called roughness elements when different appurtenances are used to configure a roughness on stilling basin bed. This type is known as a forced jump and has been studied by many researchers [e.g., 4,23,2,20,8,21,10,5,9]. A hydraulic jump is extremely in turbulent, and the flow along it is rapidly varied.…”

Section: Introductionmentioning

confidence: 99%

The performance of hydraulic jump over rough bed stilling basin consisting of cubic-shape elements

Maatooq

Taleb

2018

MATEC Web Conf.

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“…Several empirical methods are available to provide the sequent depths and Froude number at stilting basins [11][12][13]. Ellayn and Sun (2012) showed that relative to those with flat floors, the change in the duration of the leap and the ratio of the longitudinal depths are 30 to 50% and 16.5 to 30% respectively. In this analysis, the importance of Reynold's number (Re) can be ignored since, as in Abdeen et al (2015), the viscous force usually has an almost negligible effect in hydraulic jumping and open path [14,15].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

et al. 2020

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Stilling basins can be defined as energy dissipaters constructed of the irrigation systems. This study aims at investigating the performance of the new seven baffle blocks design in terms of reducing the dimensions of stilling basins in irrigation systems. In order to assess the hydraulic efficiency of a new model for baffle block used in stilling basins, a Naval Research Laboratory (NRL) has conducted. The results of this study demonstrate that the performance of the new baffle block, in term of hydraulic jump length reduction and hydraulic energy dissipation, it's better than standard blocks. However, the ratios of the drag resistance attributed to the new baffles block (FB / F2) have been larger than that applied on the normal block. It was found that the new block dissipates the energy by 9.31% more than the concrete block, and decreases the length of the hydraulic jump by 38.6% in comparison with the standard blocks. However, the new block maximizes the drag force ratio by 98.6% in comparison with the standard baffle blocks. The findings indicated that in terms of energy reduction and dissipation in the length of the hydraulic jump, the new block is superior to the other kinds.

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“…D B = D p B [1] 1973 Ov=Q@ Qy B = b 1 b 2 E 1 2 = F r 2 1 =Ks D B = 1 2 ( 1 + p 1 + 8E 1 2 ) [5] 1998 u= Q=mty w u}Dt K s = 1 4 23 [log(B) log(F r 1 )] E 2 1 = Fr 1 2 k 1 (1 k 2 ) cos D B = 1 2 ( 1 + p 1 + 8E 1 2 ) [7] 2008 u= Q=mty w u}Dtr=O@a k 1 = 1 0 37 ln(B)(1 23 + ln(F r 1 )) k 2 = 0 52(0 1 + 0 35Fr 1 0 05Fr 2 1 ) sin () 1 E 2 1 = F r 2 cos ( C s F r 2 + C e ) D B = 1 2 ( 1 + p 1 + 8E 1 2 ) [6] 2004 O}tLr= C e = (1 + 0 25Ln(B)) 1+Ln(Fr) Cs = 9 941(tan ) 2 (1 0 441LnBFr 1 5 ) [8] %OW x=Q= 1 |x]@= Q pmW x@ (F r 1 ) u=}QH |x}rw= OwQi OOa R= |a@=D CQwYx@ " = 0 16Fr 1 2 0 8Fr 1 + 1 (1) sm = QD |=yOYQO w pmW T |=yu=tr= =@ Q@ R QDU@ |wQ Q@ |m}rwQO}y VQB |UQQ@ |Q@R |=yu=tr= xm OvO=O u=Wv G}=Dv w CiQo CQwY 2011 p=U QO R}v hrDNt VQB |UQQ@ [10] "OvQ=O |QDy@ G}=Dv '|@amt |Q@R |=yu=tr= =@ xU}=kt QO pmW T jta Vy=m 'pY=L G}=Dv w s=Hv= R}v pmW |}xwo Q@ R QDU@ |wQ Q@ |m}rwQO}y [11] "OW u=}@ 53 |r= 30 w 30 |r= 16 5 ? }DQD x@ VQB pw] w x} wv=F Twmat ?…”

mentioning

confidence: 99%

“…u=}QH \w]N Qw@a =@ |Q@R |=yu=tr= CWB QO |}x@=OQo u=}QH p}mWD "7 pmW "=yu; |wQ R= '9 89 \UwDt CQwYx@ w ? }DQD x@ 0 33 w 0 5 '0 67 |oOWR=@ |=yC@Uv p=v=m QO R}v 2=3 H=y 1 3=37|= Q@ w Q@=Q@ 11 """ |=yu=tr= =@ Q@ R QDU@ Q}F -=D |y=oW}=tR; |UQQ@ "u}W}B |=yVywSB =@ |WQ@ VvD ?} Q[ |xU}=kt "8 pmW "hrDNt |}=Qo =w |=yC@UvQO u=}QH OwQi OOa p@=kt QO VQB j=ta= C@Uv "9 pmW [5] '1998 u= Q=mty w u}Dt [6] '2004 O}tLr= [1] '1973 Ov=Q@ Qy C=ar=]t =@ O}= C=ar=]t =@ |m}ORv |v=WwBsy w Ck@=]t w OQ=O |QDW}@ Q}O=kt l}Uqm VQB ẁ =iDQ= |= Q@ u}vJty "OQ=O [14] '2013 u=DUH@ w |U}v w [8] [6] "CU= xOW u}}aD L j y 1 = 220 tan h( [14] '2013 u=DUH@ w |U}v =iDQ= |xOwOLt =@ Q@ R QDU@ xm |Qw]x@ 'CU= xDi=} V}=Ri= |Q@R`=iDQ= V}=Ri= = Q VQB u=tOv= Q u} QDW}@ 'Q[=L |xar=]t QO 2=3 H=y 1 3=37 |@Uv '1=15 H=y 1 1=68 |xOwOLt QO w xDW=O Q}N= |xar=]t wO x@ C@Uv |U}v C=ar=]t G}=Dv =@ w [6] '2004 O}tLr= VywSB x@ C@Uv u=tOv= Q u} QDW}@ uDiQo Q_v QO =@ "CU= xDW=O |m}ORv Q=}U@ |oDU@ty [14] '2013 u=DUH@ w VQB u=tOv= Q QO |}=Qo =w C@Uv Q}F -=D |UQQ@ w O w G '?…”

mentioning

confidence: 99%

بررسی آزمایشگاهی تاثیر بستر زبر با المان‌های ذوزنقه‌یی غیرممتد در مشخصات پرش گسسته در کانال مستطیلی غیر منشوری

دانشفراز¹,

ماجدی²,

میرزایی³

et al. 2020

مهندسی عمران

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'j=ta= C@Uv '= Qo =w`]kt '|m}rwQO}y VQB '|}xkvRwP u=tr= %|O}rm u=oS=w "|SQv= lqyDU= xtOkt "1 |m}rwQO}y VQB |=y|oS}w xrtH R= 'sm ?=}=B jta w uQ=kDt=v u=}QH x@ p}=tD '|SQv= xDU@ '|v=yo=v |= Qo =w`]kt QO "CU= |QwWvt p=v=m x@ C@Uv |QwWvtQ}e p=v=m QO VQB 1 'R-jump) Q= Qi VQB`wv Q=yJ '?=}=B jta w VQB |xHvB |Q}oQ= Qk pLt x@ 4 (C jump) l}Uqm VQBw 3 '(T-jump)|r=kDv=VQB 2 '(S-jump)xDUUo Q}}eD pLt QO VQB |xHvB u; QO xm CU= |WQB 'xDUUo VQB "OQ}o|t pmW |=y?=Dre uwO@ w CU= |v=Uwv w uQ=kDt=v CH x@ x}@W QDW}@ w OyO|t MQ`]kt 'CUOu}}=B p=v=m |xQ=w}O CtU l} x@ u; uQ=kD CyH "OwW|t p}mWD |L]U OwW p}=tDt p=v=m |=yxQ=w}O R= |m} CtU x@ OQ=O p=tDL= w CU= |iO=YD , qt=m uwvm=D '|v=yo=v |= Qo =w`]kt QO VQB CN=vW C}ty= x@ xHwD =@ [3w2] "1 pmW VQB 'xDWPo |=yp=U QO "CU= xDiQ}PB CQwY XwYN u}= QO |O=}R C=ar=]t C=@U=Lt QO |oO}J}B w |}=[i C=}YwYN x@ xHwD =@ h=Y QDU@ |wQ Q@ xDUUo |v}@V}B |= Q@ |}xrO=at p}NO |=yQDt= Q=B T=U= Q@ w xOW xar=]t w |UQQ@ u; [74w1] "1 pwOH CU= xOW x=Q= VQB j=ta= C@Uv |xrY=i QO u=}QH u; ?Hwt x@ xm 'CU=`}QU Q}eDt u=}QH l} |m}rwQO}y VQB s]qD =@ xm 'OwW|t p}O@D |v=QL@ Q} R Cr=L x@ |v=QL@ jwi Cr=L R= |y=Dwm Q@ "OwW|t |v=QL@ jwi u=}QH |W@vH |SQv= lqyDU= Ea=@ w CU= x= Qty |O=}R QwmPt O= R=t |SQv= 'Vt= Q; |=yxJ[wL QO |m}rwQO}y VQB O=H}= =@ 'T=U= u}ty xm |}=Hu; R= "Ovm|t |Q}owrH p=v=m CUOu}}=B V}=UQi R= w OwW|t lryDUt CUOu}}=B ?; jta x@ Vt=Q; |=yxJ[wL QO |m}rwQO}y VQB C}@FD w p}mWD x@ 'OW=@ sm VQB p}mWD |= Q@ p=v=m ?=}=B jta xm |OQ=wt QO 'OQ=O |oDU@ p=v=m hm |Q=OQ@l=N QO OwHwt CqmWt w R=}vOQwt jta u}t-=D |=yC}OwOLt p}rO R= u=v}t]= pwYL |=yVwQ R= |m} Ov=wD|t`]kt |}=Qo =w 'Vt= Q; |xJ[wL lqyDU= V}=Ri= 'VQB pw] V}=Ri= 'j=ta= C@Uv Vy=m [1] "OW=@ VQB p}mWD

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Hydraulic jump basins with wedge-shaped baffles

Cited by 14 publications

References 14 publications

The performance of hydraulic jump over rough bed stilling basin consisting of cubic-shape elements

The performance of hydraulic jump over rough bed stilling basin consisting of cubic-shape elements

The Effects of Different Shaped Baffle Blocks on the Energy Dissipation

بررسی آزمایشگاهی تاثیر بستر زبر با المان‌های ذوزنقه‌یی غیرممتد در مشخصات پرش گسسته در کانال مستطیلی غیر منشوری

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