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Chapter 5
Experimental Heat Transfer to Water at Supercritical Pressures

Excerpt

Water is the most investigated fluid in near-critical and supercritical regions. All primary sources of heat-transfer experimental data of water flowing inside vertical circular tubes are listed in Table 5.1. Ranges of investigated parameters for selected experiments with water in circular tubes at supercritical pressures that are relevant to SCWR operating range are shown in Figure 5.1.

Swenson et al. (1965) found that HTC has a peak when the film temperature is within the pseudocritical temperature range (Figures 5.2 and 5.3). This peak in HTC decreases with increase in pressure and heat flux.

Vikhrev et al. (1971, 1967) conducted experiments in supercritical water flowing in a vertical tube (Figure 5.4). To be able to cover a wide range of bulk-fluid enthalpies (see Figure 5.4c,d), experiments were conducted in the same flow geometry, same mass flux and heat flux, but at various inlet temperatures (enthalpies). Later, these data were combined into one curve. However, this method is not the perfect one, because entrance and∕or exit (i.e., deteriorated heat transfer at the exit) effects do not allow matching properly two or several series in one plot (for details, see original figures in Vikhrev et al. (1967)). Therefore, it is important to perform supercritical heat-transfer experiments in one sufficiently long-heated test section.

  • Heat Transfer in Vertical Circular Tubes and Coils
  • Heat Transfer in Horizontal Test Sections
  • Heat Transfer in Annuli
  • Heat Transfer in Bundles
  • Free-Convection Heat Transfer
  • Final Remarks and Conclusions

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