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23-Chem-B1 Transport Phenomena: May 2015

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

  1. Question 1 A1 — Average velocity of laminar pipe flow
  2. Question 2 A2 — Pressure drop, benzene vs. kerosene
  3. Question 3 B1 — Conduction with temperature-dependent conductivity
  4. Question 4 B2 — Allowable fouling resistance of a tubular exchanger
  5. Question 5 C1 — Lead dissolution along a pipe section
  6. Question 6 C2 — Falling-level pool evaporation

Start with Question 1 →

Paper format: National Exams, May 2015 — 04-CHEM-B1 Transport Phenomena; 3 hours, open book. Six problems in three sections (A Fluid Mechanics, B Heat Transfer, C Mass Transfer), each worth 25 marks; candidates attempt one problem from each section plus a fourth from any section (four of six marked). The worked solutions below cover all six problems. A summary of the conservation equations (continuity, Navier–Stokes, energy, species) is supplied as Appendix A in the paper and is used throughout.

Reference texts: R. B. Bird, W. E. Stewart & E. N. Lightfoot, Transport Phenomena (2nd ed., Wiley) — the equations of change and the differential momentum / energy / species balances used across every problem; J. R. Welty, C. E. Wicks, R. E. Wilson & G. L. Rorrer, Fundamentals of Momentum, Heat and Mass Transfer (Wiley) — pipe-friction and boundary-layer mass-transfer correlations; F. P. Incropera & D. P. DeWitt, Fundamentals of Heat and Mass Transfer (Wiley) — conduction with variable conductivity, exchanger analysis; D. Q. Kern, Process Heat Transfer (McGraw-Hill) — the Kern casing-side method and the LMTD–correction-factor chart for multiple casing passes; R. H. Perry & D. W. Green, Perry’s Chemical Engineers’ Handbook (9th ed.) — physical properties and the Moody chart.