Debarghya Banerjee

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The UV spectral lines formed at transition region temperatures in the solar atmosphere, show a prevailing red-shifted emission. Using the Solar Ultraviolet Measurements of Emitted Radiation spectrometer flown on the Solar and He-liospheric Observatory spacecraft, we measure the amount of line shift as a function of the temperature for several spectral lines(More)
Experiments were performed to study subcooled film boiling of performance liquid PF-5060 (made by 3-M Company) on a horizontal copper disc. The experiments were performed for two regimes of film boiling involving departing vapor bubbles (low subcool-ing) and nondeparting vapor bubbles (high subcooling). By employing high speed digital camera, data were(More)
Pool boiling experiments were conducted with three horizontal, flat, silicon surfaces, two of which were coated with vertically aligned multiwalled carbon nanotubes (MWCNTs). The two wafers were coated with MWCNT of two different thicknesses: 9 ␮m (Type-A) and 25 ␮m (Type-B). Experiments were conducted for the nucleate boiling and film boiling regimes for(More)
Keywords: Nanotechnology Flow boiling Heat transfer enhancement Multi walled carbon nanotubes (MWCNT) Chemical vapor deposition Multi phase flows a b s t r a c t In this study we measure the flow boiling heat flux on a horizontal heater that is heated from below. The horizontal heater consists of either a bare silicon wafer or a silicon wafer that is coated(More)
The Si viii line width measurements and N e estimates based on SUMER observations are combined with LASCO and UVCS output to provide an overview of its variations with height above a polar coronal hole. From the combined dataset we find a radial dependence of the electron density, in the range 1–2 R as r −8 , from 2 to 4 R as r −4 and then as r −2.(More)
Line widths measurements of the coronal ion Si VIII connrm earlier observations which show an increase in the non-thermal velocity above the solar limb. The present data, taken at the equatorial limb, show an increase from 24 km s ?1 at the limb to 28 km s ?1 some 25,000 km above the limb. The electron density as measured from the Si VIII line pair show a(More)