{"id":557305,"date":"2024-11-05T18:17:37","date_gmt":"2024-11-05T18:17:37","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/esdu-040062012\/"},"modified":"2024-11-05T18:17:37","modified_gmt":"2024-11-05T18:17:37","slug":"esdu-040062012","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/esdu\/esdu-040062012\/","title":{"rendered":"ESDU 04006:2012"},"content":{"rendered":"<p>ESDU 04006 is one of a group of Data Items on the prediction of<br \/>\npressure drop in two-phase gas-liquid mixtures in piping<br \/>\nsystems.<\/p>\n<p>It provides techniques for the assessment of the frictional and<br \/>\ngravitational pressure gradient for fluids flowing upwards in<br \/>\nsmooth vertical pipes. This assessment requires a knowledge of the<br \/>\nphase flow rates, phase physical properties and pipe diameter. It<br \/>\nalso provides methods for estimation of the accuracy of the<br \/>\npredictions.<\/p>\n<p>Within ESDU 04006, the basic generic methodologies for the<br \/>\nempirical prediction of total pressure gradient are reviewed. A<br \/>\ndescription is then given of the development of a database of data<br \/>\non vertical two-phase flows. This database contains nearly 6000<br \/>\ncarefully selected and evaluated data points and is comparable in<br \/>\nsize with previous databases. In the validation process, many more<br \/>\nthousands of data points were rejected as being unreliable. The<br \/>\nperformance of a number of correlations for void fraction (hold-up)<br \/>\nand frictional pressure gradient was tested against the database,<br \/>\nand performance comparisons underpins a methodology for the<br \/>\nselection of the best-performing correlation under given flow<br \/>\nconditions. The results of the performance comparisons with the<br \/>\ndatabase are reviewed and the methodology for applying the results<br \/>\nis described.<\/p>\n<p>Worked examples illustrate the selection methodology and the<br \/>\ncalculation of total pressure gradient for air-water and<br \/>\nsteam-water flows.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Pressure Gradient in Upward Adiabatic Flows of Gas-Liquid Mixtures in Vertical Pipes<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/esdu\/\"><b>ESDU<\/b><\/a><\/td>\n<td>2012-11<\/td>\n<td>110<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":557315,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2675],"product_tag":[],"class_list":{"0":"post-557305","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-esdu","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/557305","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/557315"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=557305"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=557305"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=557305"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}