Merging Tee, type F_б+F_п>F_с;F_п=F_с; α=90°.
[Idelchik's Handbook, diag.#7-4] Re>4000

Merging Tee, symmetrical with sharp junction on 90°.
[Idelchik's Handbook, diag.#7-29]

Merging Tee, symmetrical equilateral with junction on 90° - sharp and shaped.

nonshaped - standard	shaped - energy efficient

Diverging Tee, type F_б+F_п>F_с;F_п=F_с; h_б=h_с; α=90°.
[Idelchik's Handbook, diag.#7-20.1] до w_б/w_с=2,0

Diverging Tee, symmetrical equilateral with sharp juntion on 90°.
[Idelchik's Handbook, diag.#7-29] для сварных тройников k=0.3; для чугунных стандартных тройников на резьбе k=1.5

Merging Tee, type F_б=F_п=F_с; α=90°; shaped

[Results of numerical and experimental research. Ziganshin A.M., Badykova L.N.] Re>10000

Sharp elbows; α=90°.
[Idelchik's Handbook, diag.#6-6] для Re>3·10³ и абс. шероховатостью Δ, мм

(аппроксимация табличных данных в диапазоне 0.25 < a₀/b₀ < 10; 0.6 < b₁/b₀ < 2, ошибка не более 15%)

Shaped elbow; α=90°; профилированные.
[Results of numerical and experimental research. Ziganshin A.M., Belyaeva E.E.] Re>1·10⁵ и абс. шероховатостью Δ, мм

(аппроксимация численных данных в диапазоне 0.25 < a₀/b₀ < 10; 0.6 < b₁/b₀ < 3, ошибка не более 20%)

ПU-shaped elbow α=90°; shaped
[Results of numerical research. Ziganshin A.M., Ozerov A.O., Solodova E.E.]

application area 0.5< l / b <15 (not shaped) и 0.5< l / b <7 (shaped) ; shaping is performed for rectangular ducts, according to specially defined outlines.

Mid-point lateral exit
[Experimental data of Taliev V.N. и numerical studies of A.M. Ziganshin, G.A. Gimadieva]

(data approximation in the range 0.225 <f < 2.4; 0 < q < 1,error not more 12%)

Lateral exit at the end of the duct
[Experimental data of Khanzhonkov V.I. и numerical studies of A.M. Ziganshin, K.E.Batrova]

(data approximation in the range 0.2 <f < 2, erroe no more than 8%)

Lateral entry at the end of the duct (2D case)

(data approximation in the range 0.2 < h/b < 1.9, error no more than 5%)

(data approximation in the range 0.2 < h/b < 1.9, error no more than 5%)

Mid-point lateral entry (2D case)

(data approximation in the range 0.1 < GO/GC < 0.95, и 0.32 < h/B < 2

Round exhaust hood;

(data approximation in the range 5° <α <80°; 0.05 < d/R < 2 (для α=5°) ÷ 11 (для α=80°), error no more than 20%)

(data is correct in range 30° <α <90°; 1 < d/R < 4,5, error no more than 19%)

Slot exhaust hood

(LDC for discrete angles from 0° to 90°; 0.5 < d/B < 2.5, error no more than 10%)

(LDC for discrete angles from 0° to 90°; 0.5 < d/B < 2.5, error no more than10%)

Sudden Expansion
non shaped by [Idelchik's Handbook, diag. 4-1] Re>3.3­·10³
shaped-numerical studies Ziganshin A.M., Naumov T.A.

application area 0.1< F₀ / F₂<0.7;shaping is performed for rectangular ducts, according to specially defined outlines.

Sudden Constriction
[Idelchik's Handbook, diag.#4-9.1] Re>1­·10⁴