{"title":"A note on the equation of heat transfer","authors":"L.S. Wang","doi":"10.1016/0094-4548(82)90005-4","DOIUrl":null,"url":null,"abstract":"<div><p>Liquids with properties <em>β</em>pv/c<sub>p</sub> ⪡ 1 and p<sup>2</sup>v<em>κ</em>/c<sub>p</sub>T ⪡ 1 are defined as “incompressible liquids”. The compression work in motion of incompressible liquid is negligibly small. The change in the internal energy of incompressible liquids with respect to the temperature is, however, proportional to c<sub>p</sub>. Motions of perfect gases in open systems under appropriate conditions and in closed systems with no net heat addition (or removal) are prescribed by the energy equation with c<sub>p</sub> as the appropriate specific heat. Otherwise, either no reduction is possible or both c<sub>p</sub> and c<sub>v</sub> may become the appropriate specific heats in the energy equation.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 5","pages":"Pages 363-370"},"PeriodicalIF":0.0000,"publicationDate":"1982-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90005-4","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Letters in Heat and Mass Transfer","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0094454882900054","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Liquids with properties βpv/cp ⪡ 1 and p2vκ/cpT ⪡ 1 are defined as “incompressible liquids”. The compression work in motion of incompressible liquid is negligibly small. The change in the internal energy of incompressible liquids with respect to the temperature is, however, proportional to cp. Motions of perfect gases in open systems under appropriate conditions and in closed systems with no net heat addition (or removal) are prescribed by the energy equation with cp as the appropriate specific heat. Otherwise, either no reduction is possible or both cp and cv may become the appropriate specific heats in the energy equation.
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