Plenum / Fan – V2 Simple Flow + Branch Split + Velocity Blocks

1. Air (solver)

Used for Re and pressure-drop calcs (SI).

Density ρ (kg/m³)

Viscosity μ (Pa·s)

2. Plenum & Inlet

Geometry in inches (display + 3D).

Plenum

Width W (in)

Height H (in)

Length L (in)

Fan / Blower Inlet

Inlet width w (in)

Inlet height h (in)

Inlet x from start (in)

3. Heat Sink (Finned)

For channel geometry and pressure drop.

Fin height b (in)

Fin thickness t (in)

Fin spacing s (in)

Fin length L_f (in)

HS lead edge x (in)

HS width (in, ≤ W)

4. Fan Curve (IP)

Q in cfm, Δp in inH₂O (0.5 HP-ish default curve).

#	Q (cfm)	Δp (inH₂O)
1
2
3
4
5
6
7

5. Solve

Fan / system intersection, velocities, Re, and air power.

Key Results

Flow rate Q* (cfm)

—

Back pressure Δp* (inH₂O)

—

Inlet velocity V_in (ft/s)

—

Channel velocity V_ch,avg (ft/s)

—

Reynolds (plenum) Re_pl

—

Reynolds (channel) Re_ch

—

Fan air power (HP)

—

6. Velocity Distribution (V2)

1D plenum-over-HS manifold – channel velocity vs x along fins.

# slices along HS

V_ch(x) (m/s, internal)

7. 3D Geometry View

Rotatable view of plenum, inlet, and finned heat sink with velocity-colored regions.

Click and drag to rotate, mouse wheel to zoom.

8. Fan & System Curves

Fan curve from table; system curve from 3-branch model with inlet & exit losses (IP axes).