import type { PipeFlowInput, PipeFlowResult } from './types.js';
/**
 * Pipe Flow Calculator (Darcy-Weisbach + Swamee-Jain)
 *
 * Calculates pressure drop and head loss for fluid flow through pipes.
 * Uses:
 * - Laminar: f = 64/Re (Re < 2300)
 * - Turbulent: Swamee-Jain explicit formula (Re > 4000)
 * - Transitional: Linear interpolation (2300 ≤ Re ≤ 4000)
 *
 * Darcy-Weisbach: ΔP = f × (L/D) × (ρv²/2)
 *
 * @throws {RangeError} Flow rate must be positive
 * @throws {RangeError} Pipe diameter must be positive
 * @throws {RangeError} Pipe length must be positive
 * @throws {RangeError} Fluid density must be positive
 * @throws {RangeError} Fluid viscosity must be positive
 * @throws {RangeError} Custom roughness must be provided and non-negative
 * @param input - flow rate, pipe geometry, fluid properties
 * @returns pressure drop, velocity, Reynolds number, flow regime
 */
export declare function pipeFlow(input: PipeFlowInput): PipeFlowResult;
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