{"id":61370,"date":"2016-07-19T17:01:00","date_gmt":"2016-07-19T21:01:00","guid":{"rendered":"https:\/\/www.nasa.gov\/?migration=converted-node-387604"},"modified":"2023-07-26T12:19:29","modified_gmt":"2023-07-26T16:19:29","slug":"heat-transfer-mechanisms-for-flow-boiling-in-microgravity-using-quantum-dots-as-temperature-sensors","status":"publish","type":"post","link":"https:\/\/www.nasa.gov\/directorates\/stmd\/space-tech-research-grants\/heat-transfer-mechanisms-for-flow-boiling-in-microgravity-using-quantum-dots-as-temperature-sensors\/","title":{"rendered":"Heat Transfer Mechanisms for Flow Boiling in Microgravity using Quantum Dots as Temperature Sensors"},"content":{"rendered":"\n<p><strong>Caleb Hammer <\/strong><br>\n<em>University of Maryland, College Park<\/em><\/p>\n\n\n\n<p>I propose an experiment to study two-phase flow boiling in microgravity. Obtaining a fundamental understanding of the nature of flow boiling fluid mechanics and heat transfer in space environments will allow more compact and efficient heat exchangers to be used in space. The experiment will be conducted using high-speed CCD cameras to record HFE 7100 flowing through a transparent sapphire tube test section. The inner wall of the tube will be lined with a transparent conducting polymer film that can be electrically heated. Quantum dots will be dispersed along the bottom half of the polymer film. Quantum dots fluoresce when excited with blue or UV light, and the intensity of their emission decreases with increasing temperature. The goal of this experiment is to track the intensity changes of the quantum dots with the CCD cameras in order to obtain a temperature distribution along the inner wall of the test section while the polymer film is heating the fluid. This temperature data can be used to obtain values for local heat transfer for the test section. Ground-based experiments will be tested first in order to confirm the validity of this method with respect to current flow-boiling correlations. The experiment apparatus will be optimized by mass and volume in order to increase feasibility of being able to run on either a parabolic flight or the International Space Station. Performing the temperature acquisition in either of these environments will allow correlations to be made for flow-boiling in microgravity environments. The resulting data from this experiment will help develop more accurate correlations for space-based heat exchangers, allowing spacecraft to distribute heat and power more consistently.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.nasa.gov\/directorates\/spacetech\/strg\/nstrf-2016\"><strong>Back to NSTRF 2016 Full List<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Caleb Hammer University of Maryland, College Park I propose an experiment to study two-phase flow boiling in microgravity. Obtaining a fundamental understanding of the nature of flow boiling fluid mechanics and heat transfer in space environments will allow more compact and efficient heat exchangers to be used in space. The experiment will be conducted using […]<\/p>\n","protected":false},"author":66,"featured_media":47963,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"nasa_hds_core_meta_l10n":"en-US","nasa_hds_core_meta_article_editor":"","nasa_hds_core_meta_article_contacts":[],"nasa_hds_core_meta_article_topic":"","nasa_hds_core_meta_linked_locations":[],"nasa_hds_core_meta_article_related_articles":[],"hds_migrate_meta_pr_release_id":"","hds_migrate_meta_pr_release_type":"","nasa_hds_core_meta_location_x":"","nasa_hds_core_meta_location_y":"","nasa_hds_core_meta_gallery_images":[],"footnotes":""},"categories":[3337],"news-tags":[],"internal-terms":[9529,12750],"coauthors":[],"parsely":{"version":"1.1.0","meta":{"@context":"https:\/\/schema.org","@type":"NewsArticle","headline":"Heat Transfer Mechanisms for Flow Boiling in Microgravity using Quantum Dots as Temperature Sensors","url":"https:\/\/www.nasa.gov\/directorates\/stmd\/space-tech-research-grants\/heat-transfer-mechanisms-for-flow-boiling-in-microgravity-using-quantum-dots-as-temperature-sensors\/","mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/www.nasa.gov\/directorates\/stmd\/space-tech-research-grants\/heat-transfer-mechanisms-for-flow-boiling-in-microgravity-using-quantum-dots-as-temperature-sensors\/"},"thumbnailUrl":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2016\/06\/hubble_friday_06242016.jpg?w=150&h=150&crop=1","image":{"@type":"ImageObject","url":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2016\/06\/hubble_friday_06242016.jpg"},"articleSection":"NASA Directorates","author":[{"@type":"Person","name":"Loura Hall"}],"creator":["Loura Hall"],"publisher":{"@type":"Organization","name":"NASA","logo":"https:\/\/www.nasa.gov\/wp-content\/themes\/nasa\/assets\/images\/nasa-logo.svg"},"keywords":["NASA Directorates","Space Technology Mission Directorate","Space Technology Research Grants"],"dateCreated":"2016-07-19T21:01:00Z","datePublished":"2016-07-19T21:01:00Z","dateModified":"2023-07-26T16:19:29Z"},"rendered":"<meta name=\"parsely-title\" content=\"Heat Transfer Mechanisms for Flow Boiling in Microgravity using Quantum Dots as Temperature Sensors\" \/>\n<meta name=\"parsely-link\" content=\"https:\/\/www.nasa.gov\/directorates\/stmd\/space-tech-research-grants\/heat-transfer-mechanisms-for-flow-boiling-in-microgravity-using-quantum-dots-as-temperature-sensors\/\" \/>\n<meta name=\"parsely-type\" content=\"post\" \/>\n<meta name=\"parsely-image-url\" content=\"https:\/\/www.nasa.gov\/wp-content\/uploads\/2016\/06\/hubble_friday_06242016.jpg?w=150&h=150&crop=1\" \/>\n<meta name=\"parsely-pub-date\" content=\"2016-07-19T21:01:00Z\" \/>\n<meta name=\"parsely-section\" content=\"NASA Directorates\" \/>\n<meta name=\"parsely-tags\" content=\"NASA Directorates,Space Technology Mission Directorate,Space Technology Research Grants\" \/>\n<meta name=\"parsely-author\" content=\"Loura Hall\" \/>","tracker_url":"https:\/\/cdn.parsely.com\/keys\/nasa.gov\/p.js"},"read_time":2,"time_ago":"8 years","featured_image":{"id":47963,"file":"https:\/\/www.nasa.gov\/wp-content\/uploads\/2016\/06\/hubble_friday_06242016.jpg","title":"The stars of the Large Magellanic Cloud","alt":"A gathering of red, white and blue stars in the constellation of Dorado","caption":"This NASA\/ESA Hubble Space Telescope image shows the globular cluster NGC 1854, a gathering of white and blue stars in the southern constellation of Dorado (The Dolphinfish). NGC 1854 is located about 135 000 light-years away, in the Large Magellanic Cloud (LMC), one of our closest cosmic neighbours and a satellite galaxy of the Milky Way. The LMC is a hotbed of vigorous star formation. Rich in interstellar gas and dust, the galaxy is home to approximately 60 globular clusters and 700 open clusters. These clusters are frequently the subject of astronomical research, as the Large Magellanic Cloud and its little sister, the Small Magellanic Cloud, are the only systems known to contain clusters at all stages of evolution. Hubble is often used to study these clusters as its extremely high-resolution cameras can resolve individual stars, even at the clusters\u2019 crowded cores, revealing their mass, size and degree of evolution."},"_links":{"self":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/61370"}],"collection":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/users\/66"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/comments?post=61370"}],"version-history":[{"count":1,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/61370\/revisions"}],"predecessor-version":[{"id":463517,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/posts\/61370\/revisions\/463517"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media\/47963"}],"wp:attachment":[{"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/media?parent=61370"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/categories?post=61370"},{"taxonomy":"news-tags","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/news-tags?post=61370"},{"taxonomy":"internal-terms","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/internal-terms?post=61370"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.nasa.gov\/wp-json\/wp\/v2\/coauthors?post=61370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}