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SUMMARY:TBC - Kieran Gilmore\, BPI and Sandy Armstrong\, BPI
DTSTART:20201029T113000Z
DTEND:20201029T123000Z
UID:TALK153418@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:CO2 Dissolution Trapping Rates in Heterogeneous Porous Media -
  Kieran Gilmore\n\nThe rate of carbon dioxide (CO2) dissolution in saline 
 aquifers is the least well‐constrained of the secondary trapping mechani
 sms enhancing the long‐term security of geological carbon storage. CO2 i
 njected into a heterogeneous saline reservoir will preferentially travel a
 long high permeability layers increasing the CO2‐water interfacial area 
 which increases dissolution rates. We provide a conservative\, first‐pri
 nciples analysis of the quantity of CO2 dissolved and the rate at which fr
 ee‐phase CO2 propagates in layered reservoirs. At early times\, advectio
 n dominates the propagation of CO2. This transitions to diffusion dominate
 d propagation as the interfacial area increases and diffusive loss slows p
 ropagation. As surrounding water‐filled layers become CO2 saturated\, pr
 opagation becomes advection dominated. For reservoirs with finely bedded s
 trata\, ∼10% of the injected CO2 can dissolve in a year. The maximum fra
 ction of CO2 that dissolves is determined by the volumetric ratio of water
  in low permeability layers and CO2 in high permeability layers.\n\nStudyi
 ng Organic Friction Modifiers in Tribological Contacts with Neutron and X-
 ray Reflectometry - Sandy Armstrong\n\nOrganic Friction Modifiers (OFMs) a
 re fatty amphiphilic molecules which are used to enhance lubricant oils\, 
 improving vehicle efficiency\, and lowering CO2 emissions. OFM mode of act
 ion is thought to involve their adsorption at metallic surfaces\, where th
 ey form compact surface films. Films on contacting metallic surfaces are b
 elieved to form planes of low shear resistance between the opposing surfac
 es\, thereby reducing friction. The true nature of the OFM operating mecha
 nism remains obscure as probing interfacial structures formed under tribol
 ogical conditions is experimentally challenging.\n\nTo understand the inte
 rfacial behaviour of OFMs under shear at elevated temperatures and pressur
 es\, a novel tribometer rig has been developed that enables the in-situ st
 udy of surfactants in tribological contacts with neutron and X-ray reflect
 ometry. Both techniques can probe the interface without significant pertur
 bation to the system and can resolve structures with nanometre resolution.
  Results collected with the tribometer at shear rates of up to 3000 s-1 wi
 ll be presented and discussed\, with an emphasis on modelling the data.\n
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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