{"id":{"repo_id":"vt","oai_identifier":"oai:vtechworks.lib.vt.edu:10919/41432"},"canonical_url":"https://search.dev.ndltd.org/etd/vt/oai:vtechworks.lib.vt.edu:10919/41432","repository":{"repo_id":"vt","name":"Virginia Tech","base_url":"https://vtechworks.lib.vt.edu/oai/request"},"display":{"title":"Moisture transfer in porous materials exposed to combined humidity and temperature gradients","abstract":"Moisture migration is responsible for much damage in modern buildings. Air infiltrations were almost eliminated because of the use of various qualities of materials and insulation. Water is mainly transferred through building materials by diffusion, under three different phases (vapor, liquid and bound). Most of the time, indoor and outdoor conditions are different and strong gradients of humidity and temperature exist within the building walls. Many models describing moisture diffusion through capillary-porous materials exist, but none of them is universally accepted. The proposed work includes a presentation of these theoretical models which will be implemented and evaluated by a series of experiments. Data is obtained for Oriented Strand Board (OSB). The existing apparatus, developed by Crimm (1992) and Mosier (1994) consists of a wood-based sample, sealed between two environmental chambers. Each chamber has its own humidity and temperature control system. This apparatus is an alternative to the standard “cup” method to determine moisture permeability of wood samples. The relative humidity is not controlled by salt solutions. Forced air circulation at the surface of the specimen results in uniform conditions in the chamber and faster results. The experimental apparatus is upgraded for better control. The relative humidity is controlled in a range of 5- 75 percent, within 0.2 percent of the setpoint, and the temperature can be maintained within 0.05°C, in a range of 15-50°C. The apparatus operation is validated by comparing a series of isothermal data with published results. Good agreement is found between these data and those reported by two different authors. Several nonisothermal experiments are conducted to implement and evaluate the moisture diffusion theory.","abstract_html":"Moisture migration is responsible for much damage in modern buildings. Air infiltrations were almost eliminated because of the use of various qualities of materials and insulation. Water is mainly transferred through building materials by diffusion, under three different phases (vapor, liquid and bound). Most of the time, indoor and outdoor conditions are different and strong gradients of humidity and temperature exist within the building walls. Many models describing moisture diffusion through capillary-porous materials exist, but none of them is universally accepted. The proposed work includes a presentation of these theoretical models which will be implemented and evaluated by a series of experiments. Data is obtained for Oriented Strand Board (OSB). The existing apparatus, developed by Crimm (1992) and Mosier (1994) consists of a wood-based sample, sealed between two environmental chambers. Each chamber has its own humidity and temperature control system. This apparatus is an alternative to the standard “cup” method to determine moisture permeability of wood samples. The relative humidity is not controlled by salt solutions. Forced air circulation at the surface of the specimen results in uniform conditions in the chamber and faster results. The experimental apparatus is upgraded for better control. The relative humidity is controlled in a range of 5- 75 percent, within 0.2 percent of the setpoint, and the temperature can be maintained within 0.05°C, in a range of 15-50°C. The apparatus operation is validated by comparing a series of isothermal data with published results. Good agreement is found between these data and those reported by two different authors. Several nonisothermal experiments are conducted to implement and evaluate the moisture diffusion theory.","abstract_has_math":false,"creators":["Chevrier, Vincent François"],"institution":"Virginia Tech","degree_name":"Master of Science","degree_level":"masters","degree_discipline":"Mechanical Engineering","degree_department":"Mechanical Engineering","school":null,"contributors":[],"advisors":[],"committee_chairs":["Thomas, William C."],"committee_members":["Mahan, James Robert","Diller, Thomas E."],"year":1996,"date_issued":"1996-03-03","date_published":"1996-03-03","updated_at":"2026-07-22T22:20:26Z","subjects":["moisture migration"],"languages":["en"],"rights":["In Copyright"],"rights_urls":["http://rightsstatements.org/vocab/InC/1.0/"],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["etd-03042009-041324"],"render_values":[{"text":"etd-03042009-041324","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10919/41432","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeechair","label":"Committee Chair","values":["Thomas, William C."]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Mahan, James Robert","Diller, Thomas E."]},{"key":"dc:contributor.department","label":"Department","values":["Mechanical Engineering"]},{"key":"dc:creator","label":"Author","values":["Chevrier, Vincent François"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-03-14T21:31:00Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-03-14T21:31:00Z","2009-03-04"]},{"key":"dc:date.issued","label":"Date","values":["1996-03-03"]},{"key":"dc:publisher","label":"Institution","values":["Virginia Tech"]},{"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":["Mechanical Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["masters"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Virginia Polytechnic Institute and State University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["moisture migration"]}]},{"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.other","label":"Dc Identifier Other","values":["etd-03042009-041324"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10919/41432"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Moisture migration is responsible for much damage in modern buildings. Air infiltrations were almost eliminated because of the use of various qualities of materials and insulation. Water is mainly transferred through building materials by diffusion, under three different phases (vapor, liquid and bound). Most of the time, indoor and outdoor conditions are different and strong gradients of humidity and temperature exist within the building walls. Many models describing moisture diffusion through capillary-porous materials exist, but none of them is universally accepted. The proposed work includes a presentation of these theoretical models which will be implemented and evaluated by a series of experiments. Data is obtained for Oriented Strand Board (OSB). The existing apparatus, developed by Crimm (1992) and Mosier (1994) consists of a wood-based sample, sealed between two environmental chambers. Each chamber has its own humidity and temperature control system. This apparatus is an alternative to the standard “cup” method to determine moisture permeability of wood samples. The relative humidity is not controlled by salt solutions. Forced air circulation at the surface of the specimen results in uniform conditions in the chamber and faster results. The experimental apparatus is upgraded for better control. The relative humidity is controlled in a range of 5- 75 percent, within 0.2 percent of the setpoint, and the temperature can be maintained within 0.05°C, in a range of 15-50°C. The apparatus operation is validated by comparing a series of isothermal data with published results. Good agreement is found between these data and those reported by two different authors. Several nonisothermal experiments are conducted to implement and evaluate the moisture diffusion theory."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["Master of Science"]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["BTD"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Moisture transfer in porous materials exposed to combined humidity and temperature gradients"]}]}],"canonical_facts":{"dc:contributor.committeechair":["Thomas, William C."],"dc:contributor.committeemember":["Mahan, James Robert","Diller, Thomas E."],"dc:contributor.department":["Mechanical Engineering"],"dc:creator":["Chevrier, Vincent François"],"dc:date.accessioned":["2014-03-14T21:31:00Z"],"dc:date.available":["2014-03-14T21:31:00Z","2009-03-04"],"dc:date.issued":["1996-03-03"],"dc:description.abstract":["Moisture migration is responsible for much damage in modern buildings. Air infiltrations were almost eliminated because of the use of various qualities of materials and insulation. Water is mainly transferred through building materials by diffusion, under three different phases (vapor, liquid and bound). Most of the time, indoor and outdoor conditions are different and strong gradients of humidity and temperature exist within the building walls. Many models describing moisture diffusion through capillary-porous materials exist, but none of them is universally accepted. The proposed work includes a presentation of these theoretical models which will be implemented and evaluated by a series of experiments. Data is obtained for Oriented Strand Board (OSB). The existing apparatus, developed by Crimm (1992) and Mosier (1994) consists of a wood-based sample, sealed between two environmental chambers. Each chamber has its own humidity and temperature control system. This apparatus is an alternative to the standard “cup” method to determine moisture permeability of wood samples. The relative humidity is not controlled by salt solutions. Forced air circulation at the surface of the specimen results in uniform conditions in the chamber and faster results. The experimental apparatus is upgraded for better control. The relative humidity is controlled in a range of 5- 75 percent, within 0.2 percent of the setpoint, and the temperature can be maintained within 0.05°C, in a range of 15-50°C. The apparatus operation is validated by comparing a series of isothermal data with published results. Good agreement is found between these data and those reported by two different authors. Several nonisothermal experiments are conducted to implement and evaluate the moisture diffusion theory."],"dc:description.degree":["Master of Science"],"dc:format.medium":["BTD"],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["etd-03042009-041324"],"dc:identifier.uri":["http://hdl.handle.net/10919/41432"],"dc:language.iso":["en"],"dc:publisher":["Virginia Tech"],"dc:rights":["In Copyright"],"dc:rights.uri":["http://rightsstatements.org/vocab/InC/1.0/"],"dc:subject":["moisture migration"],"dc:title":["Moisture transfer in porous materials exposed to combined humidity and temperature gradients"],"dc:type":["Thesis"],"dc:type.dcmitype":["Text"],"thesis:degree_discipline":["Mechanical Engineering"],"thesis:degree_level":["masters"],"thesis:degree_name":["Master of Science"],"thesis:institution_name":["Virginia Polytechnic Institute and State University"]},"updated_at":"2026-07-22T22:20:26Z"}