ABSTRACT

The present experimental investigation incorporates the winglet twisted tapes as an insert to determine the thermal and hydraulic performance of a heat exchanger tube. The purpose of connecting the winglet to the twisted tape is to improve the heat transmission while minimizing the pressure loss by not disrupting the flow at the core portion. The thermal performance of a heat exchanger with turbulent promoters is assessed by varying geometric factors, such as the size of the promoters, Twist ratio ($y/W$), Winglet pitch ratio ($P_w/L_T$), and Winglet height ratio ($h_w/b_w$). Experiments were carried out for Reynolds numbers (Re) ranging from 3,000 to 21,000. For a set of geometric parameters, the greatest thermohydraulic performance achieved was 1.58. Regression analysis is used to build a statistical association for Nusselt number $\left(Nu\right)$ and friction factor $\left(f\right),$ and the anticipated data obtained is of acceptable accuracy. The entropy generation is expressed in the form of entropy generation number and the Bejan number to fetch the dominance of thermal or friction entropy using winglet twisted tape.

摘要

目前的实验研究将小翼扭曲带作为插入物来确定热交换器管的热和水力性能。将小翼连接到绞合带的目的是改善热传递，同时通过不中断核心部分的流动来最小化压力损失。具有湍流促进剂的热交换器的热性能通过不同的几何因素进行评估，例如促进剂的大小、扭曲比 ($\mathrm{是的}/W$), 小翼螺距比 (${磷}_w/{\mathrm{大号}}_{吨}$) 和小翼高度比 ($H_w/b_w$）。对 3,000 到 21,000 的雷诺数 (Re) 进行了实验。对于一组几何参数，获得的最大热水力性能为 1.58。回归分析用于建立努塞尔数的统计关联$\left(ñ你\right)$和摩擦系数$\left(F\right),$所获得的预期数据具有可接受的准确性。熵生成以熵生成数和 Bejan 数的形式表示，以使用小翼扭曲带获取热熵或摩擦熵的优势。