An experimental investigation into forced, natural and combined forced and natural convective heat transfer from stationary isothermal circular disks

Kobus, Chris J.; Wedekind, G. L.

doi:10.1016/0017-9310(95)00096-r

Cited by 36 publications

(28 citation statements)

References 26 publications

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“…where Nu d,u is the Nusselt number of the prior research [11][12][13] assuming a uniform temperature. The question thus becomes ''how significant is the non-uniform term in Eq.…”

Section: Experimental Measurement Techniquementioning

confidence: 99%

“…Thermistors were chosen as the heat transfer models because they provided a unique combination for indirectly measuring the surface temperature and the convective heat transfer rate. Using an electrical circuit suggested by Kobus and Wedekind [13], as shown in Fig. 1, the thermistor current and resistance can be accurately and simultaneously measured during self-heating.…”

Section: Experimental Measurement Techniquementioning

confidence: 99%

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Investigation of natural convection heat transfer from uniformly heated (isoflux), thin, stationary circular disks at arbitrary angles of inclination

Kobus¹

2007

Experimental Thermal and Fluid Science

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“…where Nu d,u is the Nusselt number of the prior research [11][12][13] assuming a uniform temperature. The question thus becomes ''how significant is the non-uniform term in Eq.…”

Section: Experimental Measurement Techniquementioning

confidence: 99%

Section: Experimental Measurement Techniquementioning

confidence: 99%

Investigation of natural convection heat transfer from uniformly heated (isoflux), thin, stationary circular disks at arbitrary angles of inclination

Kobus¹

2007

Experimental Thermal and Fluid Science

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“…These convective regimes are discussed in Kobus and Wedekind (1995) and are shown graphically in their Fig. 6.…”

Section: Algorithm Developmentmentioning

confidence: 99%

Hotplate precipitation gauge calibrations and field measurements

Zelasko¹,

Wettlaufer²,

Borkhuu³

et al. 2018

Atmos. Meas. Tech.

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Abstract. First introduced in 2003, approximately 70 YankeeEnvironmental Systems (YES) hotplate precipitation gauges have been purchased by researchers and operational meteorologists. A version of the YES hotplate is described in Rasmussen et al. (2011; R11). Presented here is testing of a newer version of the hotplate; this device is equipped with longwave and shortwave radiation sensors. Hotplate surface temperature, coefficients describing natural and forced convective sensible energy transfer, and radiative properties (longwave emissivity and shortwave reflectance) are reported for two of the new-version YES hotplates. These parameters are applied in a new algorithm and are used to derive liquidequivalent accumulations (snowfall and rainfall), and these accumulations are compared to values derived by the internal algorithm used in the YES hotplates (hotplate-derived accumulations). In contrast with R11, the new algorithm accounts for radiative terms in a hotplate's energy budget, applies an energy conversion factor which does not differ from a theoretical energy conversion factor, and applies a surface area that is correct for the YES hotplate. Radiative effects are shown to be relatively unimportant for the precipitation events analyzed. In addition, this work documents a 10 % difference between the hotplate-derived and new-algorithmderived accumulations. This difference seems consistent with R11's application of a hotplate surface area that deviates from the actual surface area of the YES hotplate and with R11's recommendation for an energy conversion factor that differs from that calculated using thermodynamic theory.

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“…Although not easy, these phenomena could be investigated by experiments. However, we can only cite two experimental investigations by Oosthuizen and Bassey [4] and Kobus and Wedekind [5] for such examples. They have measured the overall heat transfer coefficients from vertical heated plates 12 to 25 mm long to a uniform downward flow of air.…”

Section: Introductionmentioning

confidence: 96%

Fluid flow and heat transfer of opposing mixed convection adjacent to downward‐facing, inclined heated plates

Kitamura

Matsumoto

Mitsuishi

et al. 2008

Heat Trans. Asian Res.

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Experimental investigations were carried out for opposing mixed convective flows of air adjacent to downward-facing, inclined heated plates. The experiments covered the ranges of the Reynolds and modified Rayleigh numbers from Re L = 400 to 4600 and Ra L * = 1.0 × 10 7 to 5.4 × 10 8, and the inclination angles from θ = 15 to 75° from horizontal. The flow fields over the plates were visualized with smoke. The results showed that a separation of forced boundary layer flow occurs first at the bottom edge of the plate, and then the separation point shifts toward upstream with increasing wall heat flux, and finally, reaches the top edge of the plates. It was found that the separations at the bottom and top edges are predicted with a non-dimensional parameter (Gr Lθ * / Re L 2.5 ) = 0.35 and 1.0, respectively. The local heat transfer coefficients of the inclined plates were also measured and the results showed that the minimum coefficients appear in the separation region. Moreover, it was revealed that forced, natural, and combined convective flows can be classified by the non-dimensional parameter (Gr Lθ * / Re L 2.5).

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An experimental investigation into forced, natural and combined forced and natural convective heat transfer from stationary isothermal circular disks

Cited by 36 publications

References 26 publications

Investigation of natural convection heat transfer from uniformly heated (isoflux), thin, stationary circular disks at arbitrary angles of inclination

Investigation of natural convection heat transfer from uniformly heated (isoflux), thin, stationary circular disks at arbitrary angles of inclination

Hotplate precipitation gauge calibrations and field measurements

Fluid flow and heat transfer of opposing mixed convection adjacent to downward‐facing, inclined heated plates

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