Vacuum network and pumpdown workspace

Knudsenpath

Model the path. Follow the pressure. Hand off the evidence.

Regime-awareViscous, transitional, and molecular screening

Pressure-awareEditable pump curves and changing conductance

ComparableBaseline and candidate traces side by side

AuditablePDF, CSV, JSON, text, and SHA-256

A system, not a single equation

Build the chamber-to-pump path you actually need to review

Knudsenpath combines geometry, empirical restrictions, gas properties, pressure-speed data, and gas load in one local project. Every result stays tied to the assumptions that produced it.

Assemble the path

Add straight tubes, elbows, apertures, valves, and custom components. Disable an element without deleting its record.

Screen each regime

Review Knudsen number, molecular and viscous limits, screened conductance, and long-tube boundary findings.

Enter the real curve

Use pressure-speed points and ultimate pressure instead of treating a pump as one fixed nominal number.

Include the gas load

Combine leaks and surface outgassing, inspect the Q/S floor, and see why a target may not be reachable.

Current build 4 interface

From bench inputs to a reviewable decision

Knudsenpath vacuum bench on iPhone — Live chamber, pressure, gas-load, and target status

Knudsenpath conductance network on iPhone — Series restrictions and pressure-regime ledger

Knudsenpath pumpdown trace on iPhone — Numerical pressure trace and editable pump curve

Knudsenpath evidence handoff on iPhone — Evidence export, notes, and unit cross-check

Compare before changing hardware

See whether the candidate earns its complexity

Overlay pumpdown traces and compare conductance, chamber speed, Q/S floor, and target time. Diameter and pump-speed sensitivity sweeps expose where another change still matters.

Knudsenpath comparing baseline and wider-line candidate on a 13-inch iPad

Knudsenpath evidence handoff and primary references on iPad

Portable evidence, generated offline

A handoff another person can inspect

Project JSONEditable source assumptions and notes
Five CSV filesComponents, pump curve, trace, milestones, sensitivity
PDF + textReadable summary and model boundary
SHA-256Checksum manifest for every exported file

Bounded by design

Useful estimates require honest limits

Knudsenpath is a planning and documentation aid. It does not control equipment, certify a design, replace gas-specific manufacturer curves, predict every transition-flow geometry, or substitute for measured commissioning and qualified engineering review.

The bundled projects are labeled synthetic examples. Replace them with measured geometry, supplier data, and project-specific gas-load assumptions.

Primary technical references

The basis is visible in the app

Leybold vacuum conductance fundamentals Leybold pumpdown-time guidance Pfeiffer Vacuum knowledge book