Pool boiling heat transfer

Heat transfer to boiling liquids occurs in a number of operations, for example, distillation and evaporation. Heat is transferred by both conduction and convection in a process further complicated by the phase change that occurs at the heating boundary. When boiling is induced by a heater in contact with a pool of liquid, the process is known as pool boiling. Liquid movement... 

The linkage between the enhancement of heat transfer at boiling of dilute polymer solutions and the elastic properties of the system is confirmed by the existence of the optimal concentration corresponding to (see Figure 7.2.14). Such peak performance at saturated pool boiling at atmospheric pressure of water solution of HEC QP-300 with molecular mass M 600 kg/mol was observed also elsewhere for instance, up to 45% increase in the boiling heat transfer coefficient, compared to that in pure water, was... 

Likewise, the microscopic heat-transfer term takes accepted empirical correlations for pure-component pool boiling and adds corrections for mass-transfer and convection effects on the driving forces present in pool boiling. In addition to dependence on the usual physical properties, the extent of superheat, the saturation pressure change related to the superheat, and a suppression factor relating mixture behavior to equivalent pure-component heat-transfer coefficients are correlating functions. 

The following nucleate or alternate designs procedure, suggested by Kem, is for vaporization (nucleate or pool boiling) only. No sensible heat transfer is added to the boiling fluid. 

Magrini, V. and E. Mannei, On the Influence of the Thickness and Thermal Properties of Heating Walls on the Heat Transfer Coefficients in Nucleate Pool Boiling, Trans. ASMEfoumal of Heat Transfer, May (1974) p. 173. 

Raben, 1. A., R. T. Beaubouef, and G. Commerford, A Study of Nucleate Pool Boiling of Water at Low Pressure, 6 Nat l. Heat Transfer Conference, Boston, Aug. (1963), AlChE Preprint No. 28. 

Vachon, R. I., G. H. Nix, G. E. Tanger, and R. O. Cobb, Pool Boiling Heat Transfer from Teflon-Coated Stainless Steel, ASME Journal Heat Trans., V. 91, Aug. (1969) p. 364. 

C8. Costello, C. P., and Adams, J. M., Burnout heat fluxes in pool boiling at high accelerations, Intern. Develop. Heat Transfer Pt. II, Paper No. 30. ASME (1961). 

Ivey, H. J., Acceleration and the critical heat flux in pool boiling heat transfer, Proc. Inst. Mech. Engrs. (London) (1962). 

PfORO, I.L. Int. Jl. Heat Mass Transfer 42 (1999) 2003. Experimental evaluation of constants for the Kohsenow pool boiling correlation. 

Tzanand YL, Yang YM (1990) Experimental study of surfactant effects on pool boiling heat transfer J Heat Transfer 112 207-212... 

Wang BX, Peng XF (1994) Experimental investigation of liquid forced-convection heat transfer through micro-channels. Int J Heat Mass Transfer 37 73-82 Wasekar VM, Manglik RM (2002) The influence of additive molecular weight and ionic nature on the pool boiling performance of aqueous surfactant solutions. Int J Heat Mass Transfer 45 483-493... 

Wu WT, Yang YM (1992) Enhanced boiling heat transfer by surfactant additives. In Pool and External Flow Boiling. ASME, New York, pp 361-366... 

Zhang J, Manglik RM (2005) Additive adsorption interfacial characteristics of nucleate pool boiling in aqueous surfactant solutions. J Heat Transfer ASME 127 684-690... 

Hetsroni G, Zakin JL, Lin Z, Mosyak A, Pancallo EA, Rozenblit R (2001) The effect of surfactants on bubble grows, wall thermal patterns and heat transfer in pool boiling. Int J Heat Mass Transfer 44 485-497... 

Liu Z, Winterton RHS (1991) A general correlation for saturated and subcooled flow boiling in tubes and annuli, based on a nucleate pool boiling equation. Int J Heat Mass Transfer 34 2759-2766... 

Shah RK, London AL (1978) Laminar flow forced convection in ducts a source book for compact heat exchanger analytical data. Advances in Heat Transfer, suppl 1. Academic, New York Sher 1, Hetsroni G (2002) An analytical model for nucleate pool boiling with surfactant additives. Int J Multiphase Flow 28 699-706... 

The mechanism of heat transfer from a submerged surface to a pool of liquid depends on the temperature difference between the heated surface and the liquid Figure 12.54. At low-temperature differences, when the liquid is below its boiling point, heat is transferred by natural convection. As the surface temperature is raised incipient boiling occurs, vapour... 

Estimate the heat-transfer coefficient for the pool boiling of water at 2.1 bar, from a surface at 125°C. Check that the critical flux is not exceeded. 

ZUBER, N., Tribus, M. and Westwater, J. W. (1961) Second International Heat Transfer Conference, Paper 27, p. 230, Am. Soc. Mech. Eng. The hydrodynamic crisis in pool boiling of saturated and sub-cooled liquids. 

The boiling film coefficient for a kettle reboiler can be estimated from the correlation for pool boiling. Equation 15.96 gives one such method due to Palen15. However, the correlation requires the heat flux to be known, and therefore the heat transfer area to be known. Hence the calculation will need to be iterative. An initial estimate of the overall heat transfer coefficient of 2000 W-m 2-K 1 gives ... 

---