#process-engineering

Fluid-viscosity physics as an API, computed locally and deterministically. The sutherland endpoint gives the dynamic viscosity of a gas at any temperature from Sutherland’s law, μ(T) = μ_ref·(T/T_ref)^1.5·(T_ref+S)/(T+S), with built-in constants for air, nitrogen, oxygen, carbon dioxide, hydrogen, helium and argon (or your own μ_ref, T_ref and S) — air comes out at about 1.72×10⁻⁵ Pa·s at 0 °C, 1.84×10⁻⁵ at 25 °C and 2.17×10⁻⁵ at 100 °C, returned in Pa·s, micro-Pa·s and centipoise. The kinematic endpoint converts between dynamic viscosity μ and kinematic viscosity ν through the density, ν = μ/ρ and μ = ν·ρ, so water at 1.002 cP and 998 kg/m³ becomes about 1.004 cSt. The convert endpoint handles viscosity units both ways — dynamic between Pa·s, centipoise and poise (1 Pa·s = 1000 cP = 10 P) and kinematic between m²/s, centistokes and stokes (1 m²/s = 10⁶ cSt = 10⁴ St). Temperatures are in °C or kelvin. Everything is computed locally and deterministically, so it is instant and private. Ideal for fluid-mechanics, CFD, process-engineering, lubrication, HVAC and chemical-engineering app developers, viscosity-correlation and unit-conversion tools, and simulation software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This computes viscosity; for the Reynolds number that uses it use a Reynolds API.

api.oanor.com/viscosity-api

Control-valve flow-coefficient (Cv / Kv) maths as an API, computed locally and deterministically. The liquid endpoint sizes a control valve for liquid service using Q = Kv·√(ΔP/SG): give any two of the flow rate (m³/h), the pressure drop across the valve (bar) and the flow coefficient Kv, and it returns the third — the required Kv to size a valve, the flow a valve passes, or the pressure drop it develops — together with the equivalent Cv. The convert endpoint converts between the three flow coefficients in use around the world: the metric Kv, the US Cv = 1.156·Kv, and the SI Av = 2.4e-5·Cv. The opening endpoint computes how far a valve must open to pass an operating Kv against its rated Kvs, for both a linear trim (opening = Kv/Kvs) and an equal-percentage trim (opening = 1 + ln(Kv/Kvs)/ln(R) for a rangeability R), so you can keep the valve in its controllable 20–80 % travel band. Everything is computed locally and deterministically, so it is instant and private. Ideal for process, instrumentation and HVAC engineering tools, control-valve selection and commissioning, hydronic-balancing and plant-design apps, and engineering education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is control-valve sizing; for pump power and head use a pump API and for orifice-plate metering use an orifice API.

api.oanor.com/valveflow-api

Matemáticas de LMTD y efectividad-NTU para intercambiadores de calor como una API, calculadas local y determinísticamente. El endpoint lmtd calcula la diferencia de temperatura media logarítmica, LMTD = (ΔT1 − ΔT2)/ln(ΔT1/ΔT2), la temperatura de conducción promedio real de un intercambiador de calor, a partir de las temperaturas de entrada y salida de los flujos caliente y frío para una disposición de flujo en contracorriente o en paralelo, y señala un cruce de temperatura. El endpoint duty aplica Q = U·A·LMTD·F — el deber térmico es igual al coeficiente global de transferencia de calor por el área por el LMTD por un factor de corrección opcional — y resuelve para cualquiera de los parámetros (deber, coeficiente, área o LMTD) que se omita, tomando el LMTD directamente o a partir de las cuatro temperaturas. El endpoint effectiveness utiliza el método de efectividad-NTU: a partir de las tasas de capacidad calorífica del flujo caliente y frío (dadas directamente o como flujo másico por calor específico) y el número de unidades de transferencia NTU = U·A/Cmin, devuelve la relación de capacidades, la efectividad para la disposición y — dadas las temperaturas de entrada — el deber térmico máximo y real y las temperaturas de salida. Todo se calcula local y determinísticamente, por lo que es instantáneo y privado. Ideal para herramientas de ingeniería de procesos, química y mecánica, HVAC, refrigeración y diseño térmico, y educación en ingeniería. Cálculo puramente local — sin clave, sin servicio de terceros, instantáneo. En vivo, no se almacena nada. 3 endpoints. Este es un análisis de intercambiador de calor de dos flujos; para el calor sensible de un solo flujo Q = m·c·ΔT, use una API de calor específico.

api.oanor.com/lmtd-api