- Journal of Heat and Mass Transfer - Photon Foundation
- Heat and Mass Transport
- Investigations into the effect of heat and mass transfer on flow across tube bundles
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Current proposals for topics of bachelor- and master thesis you find on the following page. Institute Teaching Research Miscellaneous Intern.
Journal of Heat and Mass Transfer - Photon Foundation
Gasphase Equilibrium calculator. MCS 10 - talk. Bachelor- and Masterthesis. Job description In our institute the following job is vacant: PhD opportunity in the field of heat and mass transfer in porous media We have a PhD opportunity financially supported for developing research work in the field of heat and mass transfer in porous media.
Heat and Mass Transport
In line with this, we have investigated the effect of parameters that may be optimized to give rapid gas hydrate growth rates, such as; temperature, water content, stirring rate, and reactor size on gas hydrate growth kinetics. In line with this investigation, we have employed the correlation for the average bubble diameter from literature, based on isotropic turbulence theory for estimating the average bubble size; for analysis of the dispersion parameters of the system.
The results from these studies reveal the following: 1.
For the temperature: increased subcooling increases gas hydrate growth rates. Increased subcooling in this case gives a direct reflection of the effect of increased driving force.
Investigations into the effect of heat and mass transfer on flow across tube bundles
For the water: increased water content gave poorer gas-liquid dispersion and thus slower gas hydrate growth rates. For stirring: increased stirring increased the growth rate up to a threshold stirring rate beyond which further increase in the stirring rate did not increase the gas hydrate growth rate. This was linked to negligible heat and mass transfer effects beyond the threshold stirring rate. For reactor size scale-up with geometric similarity : though more absolute volumes of gas hydrates was formed with increased reactor size, which is due to the increased volumes of reacting components, the growth rate per unit volume of water in the reactor decreased.
In addition we have performed studies on the effect of hydrate content on heat transfer using methane hydrate, Tetrahydrofuran THF and Ethylene oxide EO hydrates. The measurements from the heat transfer experiments were analyzed using a simple heat transfer model. These studies revealed important insights on hydrate plug deposition behavior on the reactor wall, as well as heat transfer through the hydrate slurry with increasing hydrate content.
Also, the heat transfer coefficient decreased with increasing hydrate content, but remained constant once a solid hydrate mass formed. The heat transfer coefficient would change as hydrate growth progresses. Finally methane hydrate growth was modeled based on heat transfer. The findings from this study confirmed the transient nature of the heat transfer coefficient during hydrate growth and that hydrate growth can be modeled based on heat transfer if the transient nature of the heat transfer coefficient is taken into account.
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Description PhD thesis in Petroleum engineering. Has parts R. Meindinyo, T. Svartaas, and R.