Influence of Narrow Rectangular Channel (<math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <mtext>AR</mtext> <mo>=</mo> <mn>1</mn> <mo>:</mo> <mn>4</mn> </math>) on Heat Transfer and Friction for V- and W-Shaped Ribs in Turbine Blade Applications

Effective cooling of blades with a nominal pressure drop is essential for performance augmentation and thermal management gas turbines. Hence, present work aimed at determining the heat transfer enhancement friction W- V-shaped ribs inside rectangular channel having hydraulic diameter ( D h ) 0.048 m aspect ratio id="M3"> AR 1 : 4. Ribs are fixed facing downstream angle attack id="M4"> ? 45° on opposite walls. Pitch id="M5"> P between two successive 25 mm both cases. Continuous V- W-shaped height to id="M6"> e / 0.052 0.0416 pitch id="M7"> 10 12.5, respectively, have been examined Reynolds number id="M8"> Re range 20000-80000. Heat achieved id="M9"> 80000 1.94 1.8 times higher than id="M10"> 20000 ribs, respectively. Streamwise spanwise variations in local Nusselt highest which estimated be 31% 12%. For 17.5% 3.5%. id="M11"> Nu along span length 0.5 id="M12"> w due dominance apex induced secondary flow. lengths found nearly same view uniformity Maximum id="M13"> N u o rib shapes 3.9 id="M14"> 20000. Due increased height, losses ribs. loss increment 85% 42% id="M15"> 40000. shapes, impact greatest id="M16"> Thermohydraulic id="M17"> THP superior Best id="M18"> 3.7 3.4 id="M19">