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UID:c6dd74a19561a6ae1d501660c817e72d
DTSTAMP:20260706T021142Z
SUMMARY:SPC Seminar – Climate – Anubhab Roy (IIT Madras)
DESCRIPTION:Title: Collisions of cloud droplets: non-continuum lubrication 
 and the warm-rain size gap\n \nSpeaker: Anubhab Roy (IIT Madras)\n\nAbstr
 act: The growth of cloud droplets into raindrops hinges on collisions\, ye
 t classical microphysics leaves a stubborn “size gap”: above ~15 micro
 ns\, condensation is slow\, while gravitational coalescence becomes effici
 ent only beyond ~40 microns. A central obstacle is hydrodynamic: as two dr
 oplets approach\, the air between them must drain\, and continuum lubricat
 ion predicts a resistance that diverges\, so droplets on a collision cours
 e never actually touch. I will show that this singularity is an artefact o
 f the continuum approximation: once the gap falls below the air’s mean f
 ree path (~70 nm)\, the gas flow becomes rarefied\, and the resistance gro
 ws far more slowly\, allowing coalescence in finite time without invoking 
 van der Waals attraction. Building on the kinetic-theory analysis of Sunda
 rarajakumar & Koch (1996)\, we construct uniformly valid resistance and mo
 bility functions spanning the far-field continuum and near-contact non-con
 tinuum regimes\, and use them to compute collision rates and efficiencies 
 for droplet pairs settling in quiescent\, sheared and turbulent flows. The
  collision efficiency depends systematically on the size ratio\, the Knuds
 en number\, and droplet inertia\; turbulence is found to augment different
 ial sedimentation\; and the results condense into compact\, closed-form co
 llision kernels suited to cloud and aerosol models. I will close with the 
 effect of atmospheric electric fields on droplet collisions and the open q
 uestions these raise for rain initiation.\n\nA few references to our work 
 that the talk draws on:\n1. Dhanasekaran\, Roy & Koch\, Collision rate of 
 bidisperse spheres settling in a compressional non-continuum gas flow\, J.
  Fluid Mech. 910\, A10 (2021). https://doi.org/10.1017/jfm.2020.942\n2. Dh
 anasekaran\, Roy & Koch\, Collision rate of bidisperse\, hydrodynamically 
 interacting spheres settling in a turbulent flow\, J. Fluid Mech. 912\, A5
  (2021). https://doi.org/10.1017/jfm.2020.1113\n3. Patra\, Koch & Roy\, Co
 llision efficiency of non-Brownian spheres in a simple shear flow – the 
 role of non-continuum hydrodynamic interactions\, J. Fluid Mech. 950\, A18
  (2022). https://doi.org/10.1017/jfm.2022.817\n4. Patra & Roy\, Gravity-in
 duced collisions of uncharged cloud droplets in an electric field\, J. Atm
 os. Sci. 82\, 11 (2025). https://doi.org/10.1175/JAS-D-25-0040.1\n
URL:https://www.imperial.ac.uk/events/211047/spc-seminar-climate-anubhab-ro
 y-iit-madras/
DTSTART;TZID=Europe/London:20260710T140000
DTEND;TZID=Europe/London:20260710T150000
LOCATION:139\, Huxley Building\, South Kensington Campus\, Imperial College
  London\, London\, SW7 2AZ\, United Kingdom
END:VEVENT
BEGIN:VEVENT
UID:e87a449edfe1c59f782eca2795636d70
DTSTAMP:20260706T021142Z
SUMMARY:[Full] Particle Physics Masterclass – Friday 17th July 2026
DESCRIPTION: \nTHIS EVENT IS NOW FULLY BOOKED\nThe Department of Physics a
 t Imperial College London is again hosting a full day Particle Physics Mas
 terclass.\nWe invite Sixth form Physics students and their teachers to com
 e and find out about the exciting world of Experimental Particle Physics f
 rom one of the largest Particle Physics research groups in the country. We
  have run the Masterclass successfully in a similar format for a number of
  years.\nThe day will start with an Introduction to the Group and the expe
 riments and talks about current hot topics in Particle Physics. After lunc
 h\, the programme will continue and the students can have a tour of the c
 urrent undergraduate projects followed by further talks and discussions.\
 nRegistration\nReservations\, indicating the number of students and accomp
 anying teachers\, can be made using our online registration form. \nPlea
 se note\, this event will be free of charge\, A maximum number of 10 stude
 nts per school can attend\, students may also register to attend individua
 lly.\nIMPORTANT\nIf you register for this event and are subsequently unabl
 e to attend\, please let us know as soon as possible.  Demand for this ev
 ent is usually very high and notifying us allows us to offer your place to
  someone on the waiting list.\nPlease note that a £10 no-show fee may be 
 charged if you do not attend and have not informed us in advance that you 
 are unable to attend.\nBooking deadline 9th July 2026\n\nAll attendees wil
 l be contacted with further details via email prior to the event.\nPlease 
 contact Particle Physics Community Admin (Paula Brown and Paula Consiglio)
  on  fundamental@imperial.ac.uk if you need any further information.\nWe
  are looking forward to seeing you!\nProgramme\n09:00-17:00\n \nTBC
URL:https://www.imperial.ac.uk/events/210351/particle-physics-masterclass-f
 riday-17th-july-2026/
DTSTART;TZID=Europe/London:20260717T090000
DTEND;TZID=Europe/London:20260717T170000
LOCATION:Lecture Theatre 1\,  level 2 \,\, Blackett Building\, South Kensin
 gton Campus\, Imperial College London\, London\, SW7 2AZ\, United Kingdom
END:VEVENT
BEGIN:VEVENT
UID:2f4f317bae9552bbdfe1f5fd1098abda
DTSTAMP:20260706T021142Z
SUMMARY:SPC Seminar – Climate – Yumeng Chen (Reading)
DESCRIPTION:Speaker: Yumeng Chen (Reading)\nTitle: TBA\nAbstract: TBA
URL:https://www.imperial.ac.uk/events/211340/spc-seminar-climate-yumeng-che
 n-reading/
DTSTART;TZID=Europe/London:20260721T113000
DTEND;TZID=Europe/London:20260721T123000
LOCATION:711c\, Huxley Building\, South Kensington Campus\, Imperial Colleg
 e London\, London\, SW7 2AZ\, United Kingdom
END:VEVENT
BEGIN:VEVENT
UID:2918f1157fad6da69e0d61e63dd471d5
DTSTAMP:20260706T021142Z
SUMMARY:Quantum Learning Quantum: Quantum Computers and AI
DESCRIPTION:Join the Department of Physice for a public talk entitled Quan
 tum Learning Quantum: Quantum Computers and AI \nProfessor Gerard Milburn
 \, Quantum Fellow at the UK’s NQCC\, willl share his vision of how quant
 um computers and AI could transform science.\n\n \n\n\nGalileo’s great 
 insight was that we can learn about the world by building devices that rev
 eal simple\, reproducible phenomena. We push on the world\, and the world 
 pushes back. More than a century ago\, scientists discovered that some exp
 eriments produced a startling result: the world is quantum.\nQuantum theor
 y is famously strange\, yet we now understand it well enough to put it to 
 work. Quantum technologies aim to harness and control the quantum world in
  ways that can make us wealthier\, healthier and safer. In this talk\, Pro
 fessor Milburn will describe the quantum technologies that are already beg
 inning to change our lives\, including quantum computing. Looking ahead\, 
 he will explore how the combination of quantum computing and embedded arti
 ficial intelligence could create “self-driving laboratories” that acce
 lerate scientific discovery and open the door to technologies beyond our c
 urrent imagination.\nThe speaker\nProfessor Gerard Milburn FRS is one of 
 the world’s leading quantum physicists and a pioneer of quantum computin
 g research. Over a career spanning more than four decades\, he has helped 
 shape the development of technologies that harness the unusual properties 
 of the quantum world to process information in entirely new ways. His work
  has contributed to many of the foundational ideas behind modern quantum c
 omputing and quantum technologies.\n\nA Fellow of the Royal Society\, Prof
 essor Milburn has held senior leadership roles at major international rese
 arch centres and is currently Quantum Fellow at the UK’s National Quantu
 m Computing Centre\, where he helps guide the UK’s quantum computing pro
 gramme and its future applications in science and society.\n \n\n\n\nForm
 at: Main talk starts at 7pm. Refreshments will be served before the talk f
 rom 6:00pm. The audience is invited to participate and ask questions follo
 wing the talk.\n\nThis event has been organised by the Hubbard Theory Cons
 ortium\n\n
URL:https://www.imperial.ac.uk/events/211377/quantum-learning-quantum-quant
 um-computers-and-ai/
DTSTART;TZID=Europe/London:20260722T180000
DTEND;TZID=Europe/London:20260722T200000
LOCATION:Lecture Theatre 1\, Blackett Building\, South Kensington Campus\, 
 Imperial College London\, London\, SW7 2AZ\, United Kingdom
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