{"id":40186,"date":"2020-08-04T18:00:00","date_gmt":"2020-08-04T15:00:00","guid":{"rendered":"https:\/\/en.buradabiliyorum.com\/why-microwaving-liquids-is-different-from-other-heating-techniques-and-how-this-issue-can-be-resolved\/"},"modified":"2020-08-04T18:00:00","modified_gmt":"2020-08-04T15:00:00","slug":"why-microwaving-liquids-is-different-from-other-heating-techniques-and-how-this-issue-can-be-resolved","status":"publish","type":"post","link":"https:\/\/buradabiliyorum.com\/en\/why-microwaving-liquids-is-different-from-other-heating-techniques-and-how-this-issue-can-be-resolved\/","title":{"rendered":"#Why microwaving liquids is different from other heating techniques, and how this issue can be resolved"},"content":{"rendered":"

“#Why microwaving liquids is different from other heating techniques, and how this issue can be resolved<\/strong>”<\/p>\n

\n
\n
\n
\"The<\/img>
\n The silver-plated cup helps liquids heat through uniformly in microwaves. Credit: Baoqing Zeng
\n <\/figcaption><\/figure>\n<\/div>\n<\/div>\n

Tea drinkers have been saying it for years. Water heated in a microwave just isn’t the same.<\/p>\n

\n <\/section>\n

Typically, when a liquid is being warmed, the heating source\u2014a stove, for example\u2014heats the container from below. By a process called convection, as the liquid toward the bottom of the container warms up, it becomes less dense and moves to the top, allowing a cooler section of the liquid to contact the source. This ultimately results in a uniform temperature throughout the glass.<\/p>\n

Inside a microwave, however, the electric field acting as the heating source exists everywhere. Because the entire glass itself is also warming up, the convection process does not occur, and the liquid at the top of the container ends up being much hotter than the liquid at the bottom.
\nA team of researchers from the University of Electronic Science<\/a> & Technology<\/a> of China studied this nonuniform heating behavior and presents a solution to this common problem in the journal AIP Advances<\/i>.
\nBy designing a silver plating to go along the rim of a glass, the group was able to shield the effects of the microwave at the surface of the liquid. The silver acts as a guide for the waves, reducing the electric field at the top and effectively blocking the heating. This creates a convection process similar to traditional app<\/a>roaches, resulting in a more uniform temperature.
\nPlacing silver in the microwave may seem like a dangerous idea, but similar metal structures with finely tuned geometry to avoid ignition have already been safely used for microwave steam pots and rice cookers.
\n“After carefully designing the metal structure at the appropriate size, the metal edge, which is prone to ignition, is located at weak field strength, where it can completely avoid ignition, so it is still safe,” said Baoqing Zeng, one of the authors on the paper and professor of electronic science and engineering at UESTC.
\nSolids don’t undergo convection, so getting your leftovers to warm up uniformly is a completely different challenge.
\n“For solids, there is no simple way to design a bowl or plate in order to achieve a much better heating result,” Zeng said. “We can change the field distribution, but the change is very small, so the improvement is limited.”
\nThe group is considering other ways to improve nonuniformity in solid foods, but the methods are currently too expensive for practical use. For now, they’re focusing their efforts on working with a microwave manufacturer to commercialize their microwave accessories for liquids.
\nA future in which tea can be microwaved without ridicule may not be too far away.<\/p>\n

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More information:<\/strong>
\n “Multiphysics analysis for unusual heat convection in microwave heating liquid,” AIP Advances<\/i> (2020). aip.scitation.org\/doi\/full\/10.1063\/5.0013295\n <\/div>\n

\n Citation<\/strong>:
\n Why microwaving liquids is different from other heating techniques, and how this issue can be resolved (2020, August 4)
\n retrieved 4 August 2020
\n from https:\/\/phys.org\/news<\/a>\/2020-08-microwaving-liquids-techniques-issue.html<\/p>\n

This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no
\n part may be reproduced without the written permission. The content is provided for information purposes only.<\/p><\/div>\n<\/p><\/div>\n

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“#Why microwaving liquids is different from other heating techniques, and how this issue can be resolved” The silver-plated cup helps liquids heat through uniformly in microwaves. Credit: Baoqing Zeng Tea drinkers have been saying it for years. Water heated in a microwave just isn’t the same. Typically, when a liquid is being warmed, the heating…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[16],"tags":[48532,14411,48531],"class_list":["post-40186","post","type-post","status-publish","format-standard","hentry","category-sciencee","tag-and-how-this-issue-can-be-resolved","tag-condensed-matter","tag-why-microwaving-liquids-is-different-from-other-heating-techniques"],"_links":{"self":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/40186","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/comments?post=40186"}],"version-history":[{"count":0,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/posts\/40186\/revisions"}],"wp:attachment":[{"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/media?parent=40186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/categories?post=40186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/buradabiliyorum.com\/en\/wp-json\/wp\/v2\/tags?post=40186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}