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23-Chem-A3 Heat and Mass Transfer: Undated paper

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Conduction with Temperature-Dependent Conductivity
  2. Question 2 Length of a Double-Pipe Cooler — Countercurrent and Cocurrent
  3. Question 3 Single-Effect Evaporator — Steam Economy and Area at Two Feed Temperatures
  4. Question 4 Diffusion of Acetic Acid through a Stagnant Water Film
  5. Question 5 Two-Film Interphase Transfer in SO₂ Absorption
  6. Question 6 n-Heptane / n-Octane Vapour–Liquid Equilibrium from Raoult’s Law

Start with Question 1 →

Reference texts: Incropera, DeWitt, Bergman & Lavine, Fundamentals of Heat and Mass Transfer (Wiley) — variable-conductivity conduction, resistance networks, convection correlations; Coulson & Richardson, Chemical Engineering Vol. 1 (Butterworth-Heinemann) — double-pipe exchanger sizing, evaporator heat load, diffusion through stagnant films; Geankoplis, Transport Processes and Separation Process Principles (4th ed., Prentice Hall) — molecular-diffusion flux relations and two-film interphase transfer; Treybal, Mass-Transfer Operations (3rd ed., McGraw-Hill) — gas absorption. Property data from Perry's Chemical Engineers' Handbook (9th ed.).

Exam format: six problems worth 25 points each — three in Part A (Heat Transfer) and three in Part B (Mass Transfer, printed as Problems 1–3 of Part B and numbered Questions 4–6 here). At least two problems from each part must be attempted and only the first two from each section are marked. Open-book, three-hour paper. All six problems are solved here for completeness.

Paper note
This is the 16-CHEM-A3 Heat and Mass Transfer paper of May 2019. The printed paper is five pages (cover notes, Part A Problems 1–3, Part B Problems 1–3), followed by two sheets of graph paper and a periodic table.

Part A — Heat Transfer