{"id":"https://openalex.org/W7214296153","doi":"https://doi.org/10.55810/2313-0083.1150","title":"Heat Transfer and Flow Characteristics Through Acentric Twisted Oval Tubes: A 3D Numerical Investigation","display_name":"Heat Transfer and Flow Characteristics Through Acentric Twisted Oval Tubes: A 3D Numerical Investigation","publication_year":2026,"publication_date":"2026-09-25","ids":{"openalex":"https://openalex.org/W7214296153","doi":"https://doi.org/10.55810/2313-0083.1150"},"language":"en","primary_location":{"id":"doi:10.55810/2313-0083.1150","doi":"https://doi.org/10.55810/2313-0083.1150","is_oa":true,"landing_page_url":"https://doi.org/10.55810/2313-0083.1150","pdf_url":null,"source":{"id":"https://openalex.org/S4387282262","display_name":"Al-Bahir Journal for Engineering and Pure Sciences","issn_l":"2312-5721","issn":["2312-5721","2313-0083"],"is_oa":true,"is_in_doaj":true,"is_core":false,"listed_in":["doaj"],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":"cc-by-nc","license_id":"https://openalex.org/licenses/cc-by-nc","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Al-Bahir","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"diamond","oa_url":"https://doi.org/10.55810/2313-0083.1150","any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5016671832","display_name":"Mohsen H. Fagr","orcid":"https://orcid.org/0000-0002-3357-3564","observed_orcids":["https://orcid.org/0000-0002-3357-3564"]},"institutions":[{"id":"https://openalex.org/I202735123","display_name":"Thi Qar University","ror":"https://ror.org/02ypa8k59","country_code":"IQ","type":"education","lineage":["https://openalex.org/I202735123"]}],"countries":["IQ"],"is_corresponding":false,"raw_author_name":"Mohsen H. Fagr","raw_affiliation_strings":["Mechanical Engineering Department, College of Engineering, University of Thi-Qar, Nasiriyah, Iraq"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Mechanical Engineering Department, College of Engineering, University of Thi-Qar, Nasiriyah, Iraq","institution_ids":["https://openalex.org/I202735123"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5081088070","display_name":"Karim Egab","orcid":"https://orcid.org/0000-0002-1736-8894","observed_orcids":["https://orcid.org/0000-0002-1736-8894"]},"institutions":[{"id":"https://openalex.org/I202735123","display_name":"Thi Qar University","ror":"https://ror.org/02ypa8k59","country_code":"IQ","type":"education","lineage":["https://openalex.org/I202735123"]}],"countries":["IQ"],"is_corresponding":false,"raw_author_name":"Karim Egab","raw_affiliation_strings":["Mechanical Engineering Department, College of Engineering, University of Thi-Qar, Nasiriyah, Iraq"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Mechanical Engineering Department, College of Engineering, University of Thi-Qar, Nasiriyah, Iraq","institution_ids":["https://openalex.org/I202735123"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5029774999","display_name":"Hayder Mohammed Hasan","orcid":"https://orcid.org/0000-0001-9422-1848","observed_orcids":["https://orcid.org/0000-0001-9422-1848"]},"institutions":[{"id":"https://openalex.org/I4210145266","display_name":"Southern Technical University","ror":"https://ror.org/03sax3264","country_code":"IQ","type":"education","lineage":["https://openalex.org/I4210145266"]}],"countries":["IQ"],"is_corresponding":false,"raw_author_name":"Hayder M. Hasan","raw_affiliation_strings":["Shatrah Technical College, Southern Technical University, Iraq"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Shatrah Technical College, Southern Technical University, Iraq","institution_ids":["https://openalex.org/I4210145266"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":false,"cited_by_count":0,"citation_normalized_percentile":{"value":0.0,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":"9","issue":"2","first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11945","display_name":"Heat Transfer Mechanisms","score":0.9843999743461609,"subfield":{"id":"https://openalex.org/subfields/2210","display_name":"Mechanical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11945","display_name":"Heat Transfer Mechanisms","score":0.9843999743461609,"subfield":{"id":"https://openalex.org/subfields/2210","display_name":"Mechanical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10998","display_name":"Heat Transfer and Optimization","score":0.014100000262260437,"subfield":{"id":"https://openalex.org/subfields/2210","display_name":"Mechanical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10360","display_name":"Fluid Dynamics and Turbulent Flows","score":0.000699999975040555,"subfield":{"id":"https://openalex.org/subfields/2206","display_name":"Computational Mechanics"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/heat-transfer-enhancement","display_name":"heat transfer enhancement","score":0.8600000143051147},{"id":"https://openalex.org/keywords/turbulence","display_name":"turbulent flow","score":0.746999979019165},{"id":"https://openalex.org/keywords/nusselt-number","display_name":"Nusselt number","score":0.902999997138977},{"id":"https://openalex.org/keywords/friction-factor","display_name":"friction factor","score":0.996999979019165},{"id":"https://openalex.org/keywords/thermal-performance-factor","display_name":"thermal performance factor","score":1.0},{"id":"https://openalex.org/keywords/eccentricity-ratio","display_name":"eccentricity ratio","score":0.7990000247955322},{"id":"https://openalex.org/keywords/aspect-ratio","display_name":"aspect ratio","score":0.8889999985694885},{"id":"https://openalex.org/keywords/uniform-heat-flux","display_name":"constant heat flux","score":0.7749999761581421},{"id":"https://openalex.org/keywords/airflow","display_name":"air flow","score":0.765999972820282},{"id":"https://openalex.org/keywords/heat-exchangers","display_name":"heat exchangers","score":0.8429999947547913},{"id":"https://openalex.org/keywords/rng-k-epsilon-turbulence-model","display_name":"RNG k-epsilon turbulence model","score":0.9049999713897705}],"concepts":[{"id":"https://openalex.org/C130230704","wikidata":"https://www.wikidata.org/wiki/Q898280","display_name":"Nusselt number","level":4,"score":0.9053999781608582},{"id":"https://openalex.org/C57879066","wikidata":"https://www.wikidata.org/wiki/Q41217","display_name":"Mechanics","level":1,"score":0.6632999777793884},{"id":"https://openalex.org/C196558001","wikidata":"https://www.wikidata.org/wiki/Q190132","display_name":"Turbulence","level":2,"score":0.6075999736785889},{"id":"https://openalex.org/C50517652","wikidata":"https://www.wikidata.org/wiki/Q179635","display_name":"Heat transfer","level":2,"score":0.597000002861023},{"id":"https://openalex.org/C163115403","wikidata":"https://www.wikidata.org/wiki/Q631815","display_name":"Acentric factor","level":2,"score":0.567300021648407},{"id":"https://openalex.org/C192562407","wikidata":"https://www.wikidata.org/wiki/Q228736","display_name":"Materials science","level":0,"score":0.5162000060081482},{"id":"https://openalex.org/C107706546","wikidata":"https://www.wikidata.org/wiki/Q189124","display_name":"Heat exchanger","level":2,"score":0.507099986076355},{"id":"https://openalex.org/C159188206","wikidata":"https://www.wikidata.org/wiki/Q1478382","display_name":"Heat flux","level":3,"score":0.45750001072883606},{"id":"https://openalex.org/C204530211","wikidata":"https://www.wikidata.org/wiki/Q752823","display_name":"Thermal","level":2,"score":0.4496999979019165},{"id":"https://openalex.org/C29700514","wikidata":"https://www.wikidata.org/wiki/Q634340","display_name":"Heat transfer coefficient","level":3,"score":0.4284000098705292},{"id":"https://openalex.org/C97355855","wikidata":"https://www.wikidata.org/wiki/Q11473","display_name":"Thermodynamics","level":1,"score":0.40939998626708984},{"id":"https://openalex.org/C38349280","wikidata":"https://www.wikidata.org/wiki/Q1434290","display_name":"Flow (mathematics)","level":2,"score":0.4011000096797943},{"id":"https://openalex.org/C2777777821","wikidata":"https://www.wikidata.org/wiki/Q25111513","display_name":"Heat transfer enhancement","level":4,"score":0.3614000082015991},{"id":"https://openalex.org/C2776911258","wikidata":"https://www.wikidata.org/wiki/Q5501170","display_name":"Freestream","level":4,"score":0.31529998779296875},{"id":"https://openalex.org/C77993745","wikidata":"https://www.wikidata.org/wiki/Q3072364","display_name":"Shape factor","level":2,"score":0.31380000710487366},{"id":"https://openalex.org/C2780934509","wikidata":"https://www.wikidata.org/wiki/Q571589","display_name":"Condenser (optics)","level":3,"score":0.313400000333786},{"id":"https://openalex.org/C2777551473","wikidata":"https://www.wikidata.org/wiki/Q2093072","display_name":"Tube (container)","level":2,"score":0.30979999899864197},{"id":"https://openalex.org/C190538878","wikidata":"https://www.wikidata.org/wiki/Q50013","display_name":"Eccentricity (behavior)","level":2,"score":0.30809998512268066},{"id":"https://openalex.org/C111603439","wikidata":"https://www.wikidata.org/wiki/Q752193","display_name":"Boundary layer","level":2,"score":0.3052000105381012},{"id":"https://openalex.org/C15476950","wikidata":"https://www.wikidata.org/wiki/Q7854776","display_name":"Turbulence kinetic energy","level":3,"score":0.2856000065803528},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.2827000021934509},{"id":"https://openalex.org/C33134510","wikidata":"https://www.wikidata.org/wiki/Q5158348","display_name":"Concentric tube heat exchanger","level":4,"score":0.26759999990463257},{"id":"https://openalex.org/C92854067","wikidata":"https://www.wikidata.org/wiki/Q5462091","display_name":"Flow conditioning","level":4,"score":0.26460000872612},{"id":"https://openalex.org/C91721477","wikidata":"https://www.wikidata.org/wiki/Q778612","display_name":"Fin","level":2,"score":0.26429998874664307},{"id":"https://openalex.org/C203231007","wikidata":"https://www.wikidata.org/wiki/Q192768","display_name":"Paraboloid","level":3,"score":0.2517000138759613},{"id":"https://openalex.org/C90278072","wikidata":"https://www.wikidata.org/wiki/Q216320","display_name":"Fluid dynamics","level":2,"score":0.25130000710487366},{"id":"https://openalex.org/C182310444","wikidata":"https://www.wikidata.org/wiki/Q1332643","display_name":"Boundary value problem","level":2,"score":0.25029999017715454}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.55810/2313-0083.1150","doi":"https://doi.org/10.55810/2313-0083.1150","is_oa":true,"landing_page_url":"https://doi.org/10.55810/2313-0083.1150","pdf_url":null,"source":{"id":"https://openalex.org/S4387282262","display_name":"Al-Bahir Journal for Engineering and Pure Sciences","issn_l":"2312-5721","issn":["2312-5721","2313-0083"],"is_oa":true,"is_in_doaj":true,"is_core":false,"listed_in":["doaj"],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":"cc-by-nc","license_id":"https://openalex.org/licenses/cc-by-nc","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Al-Bahir","raw_type":"journal-article"}],"best_oa_location":{"id":"doi:10.55810/2313-0083.1150","doi":"https://doi.org/10.55810/2313-0083.1150","is_oa":true,"landing_page_url":"https://doi.org/10.55810/2313-0083.1150","pdf_url":null,"source":{"id":"https://openalex.org/S4387282262","display_name":"Al-Bahir Journal for Engineering and Pure Sciences","issn_l":"2312-5721","issn":["2312-5721","2313-0083"],"is_oa":true,"is_in_doaj":true,"is_core":false,"listed_in":["doaj"],"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"journal"},"license":"cc-by-nc","license_id":"https://openalex.org/licenses/cc-by-nc","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Al-Bahir","raw_type":"journal-article"},"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":58,"referenced_works":["https://openalex.org/W1993481726","https://openalex.org/W2009667580","https://openalex.org/W2010890119","https://openalex.org/W2015989810","https://openalex.org/W2030503771","https://openalex.org/W2145463029","https://openalex.org/W2210760631","https://openalex.org/W2300828160","https://openalex.org/W2594379698","https://openalex.org/W2804230602","https://openalex.org/W2900762659","https://openalex.org/W3044484655","https://openalex.org/W3093897793","https://openalex.org/W3112421223","https://openalex.org/W3161970702","https://openalex.org/W3183351143","https://openalex.org/W3205481987","https://openalex.org/W4210260298","https://openalex.org/W4220876127","https://openalex.org/W4221015292","https://openalex.org/W4226262997","https://openalex.org/W4291172401","https://openalex.org/W4294051931","https://openalex.org/W4309483283","https://openalex.org/W4319163795","https://openalex.org/W4382358065","https://openalex.org/W4385782880","https://openalex.org/W4389586829","https://openalex.org/W4391116483","https://openalex.org/W4392672274","https://openalex.org/W4396544644","https://openalex.org/W4399654549","https://openalex.org/W4401230323","https://openalex.org/W4405752511","https://openalex.org/W4407115998","https://openalex.org/W4408686776","https://openalex.org/W4410354924","https://openalex.org/W4410618740","https://openalex.org/W4413034907","https://openalex.org/W4413153381","https://openalex.org/W4413405372","https://openalex.org/W4413770790","https://openalex.org/W4415319916","https://openalex.org/W4415756359","https://openalex.org/W4415763014","https://openalex.org/W4416757602","https://openalex.org/W4417334648","https://openalex.org/W4417422612","https://openalex.org/W7083591937","https://openalex.org/W7116357822","https://openalex.org/W7118342354","https://openalex.org/W7119541122","https://openalex.org/W7123873015","https://openalex.org/W7125083018","https://openalex.org/W7127425206","https://openalex.org/W7128398713","https://openalex.org/W7128449406","https://openalex.org/W7130385049"],"related_works":["https://openalex.org/W7119587505","https://openalex.org/W4414921618","https://openalex.org/W3044484655","https://openalex.org/W4415319916","https://openalex.org/W4205382579","https://openalex.org/W4221015292","https://openalex.org/W2058384874","https://openalex.org/W2358001808","https://openalex.org/W4283385681","https://openalex.org/W4390882830"],"abstract_inverted_index":{"Tube":[0],"oval-":[1],"twisting":[2,51],"techniques":[3],"have":[4,36],"been":[5],"consistently":[6],"used":[7],"to":[8,46,75,154],"promote":[9],"heat":[10,57,78,253],"transfer":[11],"and":[12,24,53,92,112,133,147,160,166,182,187,236,259],"flow":[13,19,102],"turbulence":[14],"properties":[15],"within":[16],"tubes,":[17],"enhancing":[18],"mixing,":[20],"disturbing":[21],"boundary":[22],"layers,":[23],"hence,":[25],"offering":[26],"higher":[27,215],"thermal":[28,134,204,238],"efficiency.":[29],"However,":[30],"the":[31,47,66,87,118,139,162,167,194,217,230,237,244,252],"acentric":[32,67,198],"twisted":[33,42,68,90,170,199,233],"oval":[34,43,70,91,171,200,234],"tubes":[35,44,95,201],"more":[37,190],"intricacy":[38],"as":[39],"compared":[40,153],"with":[41,161,206],"due":[45],"eccentricity":[48,148],"of":[49,65,80,86,126,185,193,210,229],"their":[50],"pattern":[52],"using":[54],"them":[55],"in":[56,157,179],"transfer.":[58],"The":[59,109,123,150,173,197,220],"current":[60],"study":[61],"performs":[62],"8":[63],"configurations":[64],"heating":[69],"tube":[71,165],"that":[72,228],"is":[73,213,223,241],"exposed":[74],"a":[76,100,176],"constant":[77],"flux":[79],"1750W/m\u00b2.":[81],"In":[82],"addition,":[83],"2":[84],"cases":[85,159],"typical":[88,163,231],"centric":[89,169,232],"plain":[93,164,195,218],"circular":[94],"for":[96,138],"comparison":[97],"purposes":[98],"under":[99],"turbulent":[101],"regime,":[103],"10000":[104],"\u2264":[105,107],"Re":[106],"50000.":[108],"momentum,":[110],"continuity":[111],"energy":[113,257],"equations":[114],"were":[115],"solved":[116],"by":[117],"chosen":[119],"RNG":[120],"k-\u03b5":[121],"model.":[122],"main":[124],"parameters":[125],"Nusselt":[127,180,221],"number":[128,181,222],"Nu,":[129],"friction":[130,183],"factor":[131,136,184,240],"f":[132],"performance":[135,205,239],"TPF":[137],"air":[140],"flows":[141],"are":[142,152],"examined":[143],"at":[144,243],"various":[145],"aspect":[146],"ratios.":[149],"results":[151,174],"each":[155],"other":[156],"all":[158],"well-established":[168],"tube.":[172,196,219],"show":[175],"maximum":[177],"increase":[178],"196%":[186],"182%,":[188],"respectively,":[189],"than":[191,216,227],"those":[192],"provide":[202],"better":[203],"an":[207],"optimal":[208],"value":[209],"TPF=1.61,":[211],"which":[212],"61%":[214],"almost":[224],"30%":[225],"greater":[226],"tube,":[235],"(TPF=1.24)":[242],"same":[245],"conditions.":[246],"This":[247],"valuable":[248],"enhancement":[249],"may":[250],"support":[251],"exchanger":[254],"industry,":[255],"boosting":[256],"savings":[258],"carbon":[260],"dioxide":[261],"emissions.":[262]},"counts_by_year":[],"updated_date":"2026-10-12T09:40:04.860316","created_date":"2026-09-26T00:00:00"}
