{"abstract":[{"text":"Equilibrium molecular dynamics simulations, in combination with the Green-Kubo (GK) method, have been extensively used to compute the thermal conductivity of liquids. However, the GK method relies on an ambiguous definition of the microscopic heat flux, which depends on how one chooses to distribute energies over atoms. This ambiguity makes it problematic to employ the GK method for systems with nonpairwise interactions. In this work, we show that the hydrodynamic description of thermally driven density fluctuations can be used to obtain the thermal conductivity of a bulk fluid unambiguously, thereby bypassing the need to define the heat flux. We verify that, for a model fluid with only pairwise interactions, our method yields estimates of thermal conductivity consistent with the GK approach. We apply our approach to compute the thermal conductivity of a nonpairwise additive water model at supercritical conditions, and of a liquid hydrogen system described by a machine-learning interatomic potential, at 33 GPa and 2000 K.","lang":"eng"}],"article_number":"130602","publication_status":"published","publication":"Physical Review Letters","_id":"9664","doi":"10.1103/physrevlett.125.130602","author":[{"full_name":"Cheng, Bingqing","first_name":"Bingqing","orcid":"0000-0002-3584-9632","last_name":"Cheng","id":"cbe3cda4-d82c-11eb-8dc7-8ff94289fcc9"},{"first_name":"Daan","full_name":"Frenkel, Daan","last_name":"Frenkel"}],"publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"extern":"1","type":"journal_article","date_updated":"2021-08-09T12:35:58Z","volume":125,"oa":1,"user_id":"6785fbc1-c503-11eb-8a32-93094b40e1cf","external_id":{"arxiv":["2005.07562"],"pmid":["33034481"]},"status":"public","month":"09","date_created":"2021-07-15T12:15:14Z","citation":{"ista":"Cheng B, Frenkel D. 2020. Computing the heat conductivity of fluids from density fluctuations. Physical Review Letters. 125(13), 130602.","chicago":"Cheng, Bingqing, and Daan Frenkel. “Computing the Heat Conductivity of Fluids from Density Fluctuations.” <i>Physical Review Letters</i>. American Physical Society, 2020. <a href=\"https://doi.org/10.1103/physrevlett.125.130602\">https://doi.org/10.1103/physrevlett.125.130602</a>.","apa":"Cheng, B., &#38; Frenkel, D. (2020). Computing the heat conductivity of fluids from density fluctuations. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevlett.125.130602\">https://doi.org/10.1103/physrevlett.125.130602</a>","short":"B. Cheng, D. Frenkel, Physical Review Letters 125 (2020).","mla":"Cheng, Bingqing, and Daan Frenkel. “Computing the Heat Conductivity of Fluids from Density Fluctuations.” <i>Physical Review Letters</i>, vol. 125, no. 13, 130602, American Physical Society, 2020, doi:<a href=\"https://doi.org/10.1103/physrevlett.125.130602\">10.1103/physrevlett.125.130602</a>.","ama":"Cheng B, Frenkel D. Computing the heat conductivity of fluids from density fluctuations. <i>Physical Review Letters</i>. 2020;125(13). doi:<a href=\"https://doi.org/10.1103/physrevlett.125.130602\">10.1103/physrevlett.125.130602</a>","ieee":"B. Cheng and D. Frenkel, “Computing the heat conductivity of fluids from density fluctuations,” <i>Physical Review Letters</i>, vol. 125, no. 13. American Physical Society, 2020."},"article_processing_charge":"No","oa_version":"Preprint","issue":"13","quality_controlled":"1","scopus_import":"1","title":"Computing the heat conductivity of fluids from density fluctuations","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2005.07562"}],"language":[{"iso":"eng"}],"intvolume":"       125","date_published":"2020-09-25T00:00:00Z","day":"25","article_type":"original","year":"2020","publisher":"American Physical Society","pmid":1}