PLANT MYSTERIES SERIES · CHEMICAL ENGINEERING EXPLAINERS

One process mystery.
One honest explanation.

Short animated explainers — built for engineers who want to understand why.

Real equipment. Real phenomena. Explained clearly — so the next time you see a heat exchanger or a control loop, you actually know what's happening inside.

60–90sper episode
Freealways
8 topicscoming
FEATURED MYSTERY · EPISODE 01
EP 01
Heat
Transfer
EPISODE 01 · HEAT TRANSFER · AVAILABLE NOW
"Same exchanger. Same fluids.
Flip the flow — why does heat transfer jump?"

A shell-and-tube heat exchanger runs two ways. Parallel flow. Countercurrent flow. The geometry is identical. So why is countercurrent almost always better — and by how much?

T₁ T₂ hot in hot out
FIG. 1 — SHELL & TUBE EXCHANGER · COUNTERCURRENT FLOW
EPISODE INDEX · 8 TOPICS PLANNED
02 Fluid Flow Why does doubling pipe diameter cut pressure drop by up to 32× in turbulent flow? COMING SOON
03 Mass Transfer What actually happens on a distillation tray? COMING SOON
04 Reaction Engineering Why does residence time change everything in a CSTR? COMING SOON
05 Thermodynamics What is a dew-point curve and why does it matter? COMING SOON
06 Separations How does a cyclone separate without any moving parts? COMING SOON
07 Process Safety When does a relief valve open — and what happens next? COMING SOON
08 Instrumentation & Control Why does integral action eliminate steady-state error? COMING SOON
COMMON QUESTIONS · ANSWERED
ChemE
Q&A
Avisha Process engineering · curated answers
EP 01
CLICK A QUESTION TO READ THE ANSWER
Why does countercurrent flow transfer more heat than parallel flow?
What is LMTD and how do I use it?
How does a PID controller respond to a disturbance?
Why does a pump cavitate at high suction lift?
More questions answered with each new episode · Full AI tutor coming soon
FOLLOW ALONG
▶ INSTAGRAM ▶ YOUTUBE New episode every week.
LEARN WITH AVISHA · © 2026 BY AVISHA.AI ↗