The ChemE Fluid & Heat Formula Bible

This is a quick-reference companion for exams, assignments, and lab reports — not a textbook replacement. Each topic gets one page: the formula, what every symbol means, when to use it, and one fully worked example with the units carried through. Every number in it is checked step by step.

No email required. No signup. Direct download, 12 pages.

What's Inside

• 01Continuity & Bernoullithe foundation every other page builds on
• 02Reynolds Numberflow regime: laminar, transitional, turbulent
• 03Friction Factorlaminar and turbulent, with a roughness table
• 04Head Lossmajor loss plus a full fittings K-value table
• 05Pump Power & Efficiencyhydraulic power, shaft power, unit traps
• 06NPSHavoiding cavitation, worked suction-head example
• 07LMTDcounterflow vs parallel flow, paired correctly
• 08Heat Exchanger AreaQ = U·A·LMTD solved for area, with typical U-values
• 09One-Page Formula Summaryevery formula and constant, for the last five minutes before an exam
• 10Unit Traps & Common Mistakesthe actual reasons most answers come out wrong

Why This Exists

Most formula sheets online are either incomplete, wrong in small ways that cost you marks, or missing the worked example that shows you how the formula is actually used. This one is built from the same formulas that run the calculators on this site, so the PDF and the tools stay consistent with each other — if you check a hand calculation against the Reynolds Number Calculator or the LMTD Calculator, you'll get the same answer as the PDF's worked examples.

Check Your Work Instantly

Every formula in this guide has a free calculator on this site that shows full step-by-step working, not just a final answer:

Reynolds Number · Friction Factor & Head Loss · Pump Power · NPSH · LMTD · Heat Exchanger Area

Each tool also has its own practice problems page with 8 additional solved numericals.

Frequently Asked Questions