{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/106081"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/106081","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Heat transfer between a supernatant gas and a flowing vibrofluidized bed of solid particles","abstract":"The purpose of this study is to develop and demonstrate a novel process for heat recovery from hot exhaust gases. This process involves direct contact of a hot gas with a countercurrently flowing vibrofluidized bed of cold solid. Based on a simple heat-transfer model, an \"apparent\" heat-transfer coefficient between the air and solid was calculated. The temperature profile of the air as a function of heat-exchanger length was used to determine the \"apparent\" area for heat transfer in the model. Analysis, based on factorial-design experiments, showed that increasing the airflow rate and applied vibrational intensity, as well as decreasing the baffle height of the system served to increase the \"apparent\" heat-transfer coefficient. Increasing the solid flow rate produced higher heat-transfer coefficients only when the baffle was lowered past a certain \"critical\" height. Under optimum conditions investigated, a gas-to-bed heat-transfer coefficient of about 270 W/m²-K was obtained with a heat exchanger length of 0.71 m. \"Cold-flow\" experiments of the system were used to explain the heat-transfer trends. A condition analogous to \"flooding\" determined the operating range of the \"flowing\" vibrofluidized-bed heat exchanger. As a result of this work, significant progress has been made on the evolutionary development of a vibrofluidized-bed heat exchanger to be used for future heat recovery.","abstract_html":"The purpose of this study is to develop and demonstrate a novel process for heat recovery from hot exhaust gases. This process involves direct contact of a hot gas with a countercurrently flowing vibrofluidized bed of cold solid. Based on a simple heat-transfer model, an "apparent" heat-transfer coefficient between the air and solid was calculated. The temperature profile of the air as a function of heat-exchanger length was used to determine the "apparent" area for heat transfer in the model. Analysis, based on factorial-design experiments, showed that increasing the airflow rate and applied vibrational intensity, as well as decreasing the baffle height of the system served to increase the "apparent" heat-transfer coefficient. Increasing the solid flow rate produced higher heat-transfer coefficients only when the baffle was lowered past a certain "critical" height. Under optimum conditions investigated, a gas-to-bed heat-transfer coefficient of about 270 W/m²-K was obtained with a heat exchanger length of 0.71 m. "Cold-flow" experiments of the system were used to explain the heat-transfer trends. A condition analogous to "flooding" determined the operating range of the "flowing" vibrofluidized-bed heat exchanger. As a result of this work, significant progress has been made on the evolutionary development of a vibrofluidized-bed heat exchanger to be used for future heat recovery.","abstract_has_math":false,"creators":["Cheah, Chun-Wah"],"institution":"Virginia Polytechnic Institute and State University","degree_name":"M.S.","degree_level":"masters","degree_discipline":"Chemical Engineering","degree_department":"Chemical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1986,"date_issued":"1986","date_published":"1986","updated_at":"2026-07-22T22:20:07Z","subjects":[],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10919/106081","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.department","label":"Department","values":["Chemical Engineering"]},{"key":"dc:creator","label":"Author","values":["Cheah, Chun-Wah"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2021-10-26T20:10:03Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2021-10-26T20:10:03Z"]},{"key":"dc:date.issued","label":"Date","values":["1986"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Polytechnic Institute and State University"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.dcmitype","label":"Dc Type Dcmitype","values":["Text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["In Copyright"]},{"key":"dc:rights.uri","label":"Rights URI","values":["http://rightsstatements.org/vocab/InC/1.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/106081"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The purpose of this study is to develop and demonstrate a novel process for heat recovery from hot exhaust gases. This process involves direct contact of a hot gas with a countercurrently flowing vibrofluidized bed of cold solid. Based on a simple heat-transfer model, an \"apparent\" heat-transfer coefficient between the air and solid was calculated. The temperature profile of the air as a function of heat-exchanger length was used to determine the \"apparent\" area for heat transfer in the model. Analysis, based on factorial-design experiments, showed that increasing the airflow rate and applied vibrational intensity, as well as decreasing the baffle height of the system served to increase the \"apparent\" heat-transfer coefficient. Increasing the solid flow rate produced higher heat-transfer coefficients only when the baffle was lowered past a certain \"critical\" height. Under optimum conditions investigated, a gas-to-bed heat-transfer coefficient of about 270 W/m²-K was obtained with a heat exchanger length of 0.71 m. \"Cold-flow\" experiments of the system were used to explain the heat-transfer trends. A condition analogous to \"flooding\" determined the operating range of the \"flowing\" vibrofluidized-bed heat exchanger. As a result of this work, significant progress has been made on the evolutionary development of a vibrofluidized-bed heat exchanger to be used for future heat recovery."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["M.S."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Heat transfer between a supernatant gas and a flowing vibrofluidized bed of solid particles"]}]}],"canonical_facts":{"dc:contributor.department":["Chemical Engineering"],"dc:creator":["Cheah, Chun-Wah"],"dc:date.accessioned":["2021-10-26T20:10:03Z"],"dc:date.available":["2021-10-26T20:10:03Z"],"dc:date.issued":["1986"],"dc:description.abstract":["The purpose of this study is to develop and demonstrate a novel process for heat recovery from hot exhaust gases. This process involves direct contact of a hot gas with a countercurrently flowing vibrofluidized bed of cold solid. Based on a simple heat-transfer model, an \"apparent\" heat-transfer coefficient between the air and solid was calculated. The temperature profile of the air as a function of heat-exchanger length was used to determine the \"apparent\" area for heat transfer in the model. Analysis, based on factorial-design experiments, showed that increasing the airflow rate and applied vibrational intensity, as well as decreasing the baffle height of the system served to increase the \"apparent\" heat-transfer coefficient. Increasing the solid flow rate produced higher heat-transfer coefficients only when the baffle was lowered past a certain \"critical\" height. Under optimum conditions investigated, a gas-to-bed heat-transfer coefficient of about 270 W/m²-K was obtained with a heat exchanger length of 0.71 m. \"Cold-flow\" experiments of the system were used to explain the heat-transfer trends. A condition analogous to \"flooding\" determined the operating range of the \"flowing\" vibrofluidized-bed heat exchanger. As a result of this work, significant progress has been made on the evolutionary development of a vibrofluidized-bed heat exchanger to be used for future heat recovery."],"dc:description.degree":["M.S."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["http://hdl.handle.net/10919/106081"],"dc:language.iso":["en"],"dc:publisher":["Virginia Polytechnic Institute and State University"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Heat transfer between a supernatant gas and a flowing vibrofluidized bed of solid particles"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Chemical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["M.S."],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:20:07Z"}