Engineering & Science calculators
Choose a task below. Check each calculator’s assumptions and units before using its result.
Womersley Number Pulsatile Flow Calculator
Biofluid Hemodynamics: Compute the dimensionless Womersley parameter ($\alpha$), Stokes boundary layer ($\delta$), and velocity profile regime in pulsatile arterial flow.
Wort Heat Exchanger Sizing Calculator - Knockout Area
Size brewhouse sanitary plate heat exchangers (PHE), calculate Log Mean Temperature Difference (LMTD), cooling water flow rates, and hot liquor heat recovery.
Woven Fabric GSM & Areal Density Calculator
Textile weaving & fabric engineering: Predict total fabric areal density ($g/m^2$ and $oz/yd^2$), warp/weft component breakdown, and linear meter mass from yarn parameters.
WRC 107 Nozzle Stress Calculator - WRC 537 Local Stress
Calculate local circumferential and longitudinal membrane and bending stresses at cylindrical vessel-nozzle junctions subjected to external piping mechanical loads per WRC 107 / WRC 537.
Xenon Poisoning Transient & Deadtime Calculator
Compute equilibrium $^{135}\text{Xe}$ and $^{135}\text{I}$ concentrations, peak post-shutdown xenon reactivity poisoning (xenon pit), and reactor deadtime restart windows.
Xenon-135 Reactor Poisoning Calculator
Calculate Iodine-135 and Xenon-135 decay transients, post-shutdown "iodine pit" peak reactivity deficit, and minimum deadtime before reactor restart.
Yarn Numbering Count Conversion Calculator
Textile mechanics & yarn technology: Convert instantaneously between direct (Tex, dtex, Denier) and indirect (Ne, Nm, NeW, Woolen Run) linear density systems.
Yarn Twist Multiplier & TPI Calculator
Spinning engineering & yarn mechanics: Compute Turns Per Inch ($TPI$), Turns Per Meter ($TPM$), Twist Multiplier ($TM$ / $\alpha_e$), and surface helix angle.
Yoder Lens Clamping Stress Calculator
Optomechanical Precision Mechanics: Determine line contact force ($w$), contact compressive stress ($s_c$), and glass tensile stress ($\sigma_t$) per Paul Yoder formulations.