The surface of a horizontal, 7-mm-diameter cylinder is maintained at an excess temperature of 5°C in saturated water at 1 atm. Estimate the heat flux using an appropriate free convection correlation and compare your result to the boiling curve of Figure 10.4. Repeat the calculation for a horizontal, 7-μm-diameter wire at the same excess temperature. What can you say about the general applicability of Figure 10.4 to all situations involving boiling of water at 1 atm?

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(W/M)b 107 106 105 104 10³ Free convection 1 -4max -4min A eta Isolated Jets and bubbles columns ONB Nucleate B 5 ATEA AT Boiling regimes 10 P Equation 9.31 AT₂C Transition Critical heat flux, max 30 AT₂T-Ta (°C) Boiling crisis- D ATED 120 Film Leidenfrost point, min 1000 E