<![CDATA[The phenomenon of two phase flow can be foundin our nature, at the living bodyand industrial of the world. The flow of Fluid throughthe pipe bendshave a valuegreater than thepressure dropstraight pipeit’s was because the changes ingeometryandtrajectorythathave an impact onthe changeof flowpattern. This research aims to determine of theflowpatternandtwo-phase flowpressure dropthat occursthrough the 45° elbowfrom the horizontalto theverticalslopes upward. Diameter ofthepipe(D) 26.64mm, variationsthatdoaregasflow rate(Q ) (1 - 3) LPMandgasvolumefraction (β) (25 - 50) %. From theresults ofthis research we can concludedthat theflowpattern thatoccursisthe slug/plugflowwhere the greaterthe gasvolumefraction (β), the size of theslug/plugflowgreaterandinversely proportional to thepressure dropfurtherdown. Upheaval of two-phase flow patterns due to the influence of gravity occurs at the actual speed ratio of air and water (v ) at 1 LPM air 0.713 and 0.966 at 3 LPM air. The highestpressure dropoccurswiththe condition ofthe gasvolumefraction (β) of 50 %, actual speed ratio of air and water(v G /v L ) 0.764at107.415 Pa in theoretically and 214.616Paat experimentally.Keywords: 45 o elbow, flow pattern, pressure drop.]]>
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