Uploads from Lance Hedrick

Currently Playing: The 9 Bar Fallacy: Why It Was Never Ideal

Head to https://squarespace.com/lancehedrick to save 10% off your first purchase of a website or domain using code LANCEHEDRICK This video goes over the science behind pressure and flow and Darcy's Law in espresso extraction, questioning the historical precedent and modern imperative of 9 bar as being the optimal peak pressure for espresso preparation. Works Cited: Main paper of the video arguing for poroelasticity of the puck: https://arxiv.org/abs/2512.21528 Under pressure: poroelastic regulation of flow in espresso brewing Radost Waszkiewicz, Franciszek Myck, Łukasz Białas, Maria Puciata-Mroczynska, Michał Dzikowski, Piotr Szymczak, Maciej Lisicki This uses CT scanning to look at the infiltration stage (first 5 seconds of transient stage) https://pubs.aip.org/aip/pof/article/37/1/013383/3332668/Dynamics-of-liquid-infiltration-into-an-espresso Dynamics of liquid infiltration into an espresso bed using time-resolved micro-computed tomography: Insights from experiment and modeling Jamie Foster This paper simulates the effect of the swelling of coffee grounds on porosity and extraction. https://www.researchgate.net/publication/359740383_Modeling_swelling_effects_during_coffee_extraction_with_smoothed_particle_hydrodynamics Modelling swelling effects during coffee extraction with smoothed particle hydrodynamics Mo, Navarini This paper discusses fines migration and effects on permeability and porosity. https://www.researchgate.net/publication/333451051_Mesoscopic_modelling_and_simulation_of_espresso_coffee_extraction Modeling swelling effects during coffee extraction with smoothed particle hydrodynamics Navarini and Ellero This paper discusses particle erosion in extraction. https://www.researchgate.net/publication/354403653_Modeling_the_effect_of_flow-induced_mechanical_erosion_during_coffee_filtration Modeling the effect of flow-induced mechanical erosion during coffee filtration Mo, Navarini, Ellero, Johnston This is the paper referenced going over swelling and erosion together. https://arxiv.org/abs/2012.15624 Flow through time-evolving porous media: swelling and erosion Matias, Coelho, et al LINKS __________________ Join my Patreon community at: https://www.patreon.com/lancehedrick Find me on IG at: https://www.instagram.com/lancehedrick Find me on Facebook at: https://www.facebook.com/lancehedrickcoffee My storefront: https://www.amazon.com/shop/lancehedrick Shop ID: https://amzn.to/48CcpTj My SECOND Channel: Lance Hedrick Unfiltered @LanceHedrickUnfiltered TIME CUES: 0:00- 9 Bar Dilemma 3:48- Darcy's Law 8:00- Squarespace 9:09- 9 Bar Supremacy 11:00- Mechanisms Over the Years 12:30- Poroelastic Puck 13:45- Darcy's Apex 15:25- Replicating on My Machines 17:23- WhAt AbOuT cReMa? 18:36- Secondary Compaction? 19:59- FLOW Supremacy 22:29- Darcy Shots and Channeling