Reynolds soni — inersiya kuchlari va qovushqoq kuchlar nisbatini ifodalovchi o'lchamsiz kattalik: Re = vD/ν. U oqimning laminar ( 4000).

Laminar va turbulent oqimni nima belgilaydi?

Re 4000 dan yuqori: turbulent (tartibsiz). Bu chegaralar quvur ichidagi oqimga tegishli.

Kinematik qovushqoqlik nima?

Kinematic viscosity ν = μ/ρ, with units m²/s or cSt (1 cSt = 10⁻⁶ m²/s). Water at 20°C: ~1 cSt. Hydraulic oil ISO VG 46 at 40°C: ~46 cSt.

Reynolds soni nima uchun muhim?

Re ishqalanish koeffitsientini, issiqlik uzatish koeffitsientini va aralashish xarakterini aniqlaydi. Bu quvur o'lchamlarini tanlashda, nasos tanlashda va bosim yo'qotishlarini hisoblashda muhim ahamiyat kasb etadi.

Gidrodinamik kirishish uzunligi nima?

Entry length is the distance from pipe inlet before the flow profile becomes fully developed. Laminar: Le ≈ 0.06·Re·D. Turbulent: Le ≈ 4.4·Re^(1/6)·D.

Muhandislik uchun bepul vosita

Reynolds soni kalkulyatori

Reynolds sonini tezlik yoki oqim sarfi bo'yicha hisoblang. Laminar/o'tish/turbulent rejimning vizual ko'rsatkichi. Kirishish uzunligini hisoblash va keng tarqalgan suyuqlik oldindan sozlamalari.

Re = vD/ν Laminar / Turbulent Entry Length Fluid Presets

Results

Reynolds soni

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Flow Regime

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Flow Velocity

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Kritik tezlik (Re=2300)

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Kirishish uzunligi Le

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Kirishish uzunligi / Diametr

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Laminar2300Transition4000Turbulent

Oqim Rejimini Vizualizatsiya Qilish

Reynolds soni

Reynolds soni — oqayotgan suyuqlikdagi inersiya kuchlari bilan yopishqoqlik kuchlari nisbati:

v — oqim tezligi (m/s)
D — quvurning ichki diametri (m)
ν — kinematic viscosity (m²/s); 1 cSt = 10⁻⁶ m²/s
ρ — suyuqlik zichligi (kg/m³)
μ — dinamik yopishqoqlik (Pa·s)

Oqim Rejimi Chegaralari

Reynolds Range	Regime	Characteristics
Re < 2,300	Laminar	Tekis, tartibli qatlamlar; ishqalanish koeffitsienti f = 64/Re; bashorat qilinadigan
2,300 – 4,000	Transition	Beqaror; vaqti-vaqti bilan turbulentlik; bu sohada loyihalashdan saqlaning
Re > 4,000	Turbulent	Xaotik; yuqori ishqalanish; f uchun Colebrook-White formulasidan foydalaning

Gidrodinamik Kirish Uzunligi

Quvur kirishidan tezlik profilining to'liq shakllanishigacha bo'lgan masofa:

Keng Tarqalgan Suyuqliklarning Yopishqoqligi

Fluid	Temperature	ν (cSt)	ρ (kg/m³)
Water	20°C	1.004	998
Water	40°C	0.658	992
Water	80°C	0.365	972
Gidravlik Yog' ISO VG 32	40°C	32	870
Gidravlik Yog' ISO VG 46	40°C	46	870
Gidravlik Yog' ISO VG 68	40°C	68	880
Air	20°C, 1 atm	15.6	1.204
Motor Moyi SAE 30	40°C	100	880

Amaliy Misol

Misol — Gidravlik Tizim

Given: v = 2 m/s, D = 25 mm, Oil ISO VG 32 at 40°C (ν = 32 cSt)

Re = 2 × 0.025 / (32 × 10⁻⁶) = 1,563

Regime: Laminar (Re < 2300)

Entry length: Le = 0.06 × 1563 × 0.025 = 2.34 m

Critical velocity for Re = 2300: v_crit = 2300 × 32 × 10⁻⁶ / 0.025 = 2.94 m/s

💡 Tip: Yog' ishlatilgan gidravlik tizimlarda (ν = 30–100 cSt) yuqori yopishqoqlik tufayli oqim deyarli har doim laminar bo'ladi. Suv tizimlarida esa ν ≈ 1 cSt bo'lganligi sababli oqim odatda turbulent xarakter kasb etadi.