Purpose

Using suspended nanoparticles in the base fluid is known as one of the most efficient ways for heat transfer augmentation and improving the thermal efficiency of various heat exchangers. Different types of nanofluids are available and used in different applications. The main purpose of this study is to investigate the effects of using hybrid nanofluid and number of plates on the performance of plate heat exchanger. In this study, TiO₂/water single nanofluid and TiO₂-Al₂O₃/water hybrid nanofluid with 1% particle weight ratio have been used to prepare hybrid nanofluid to use in plate type heat exchangers with three various number of plates including 8, 12 and 16.

Design/methodology/approach

The experiments have been conducted with the aim of examining the impact of plates number and used nanofluids on heat transfer enhancement. The performance tests have been done at 40°C, 45°C, 50°C and 55°C set outlet temperatures and in five various Reynolds numbers between 1,600 and 3,800. Also, numerical simulation has been applied to verify the heat and flow behavior inside the heat exchangers.

Findings

The results indicated that using both nanofluids raised the thermal performance of all tested exchangers which have a various number of plates. While the major outcomes of this study showed that TiO₂-Al₂O₃/water hybrid nanofluid has priority when compared to TiO₂/water single type nanofluid. Utilization of TiO₂-Al₂O₃/water nanofluid led to obtaining an average improvement of 7.5%, 9.6% and 12.3% in heat transfer of heat exchangers with 8, 12 and 16 plates, respectively.

Originality/value

In the present work, experimental and numerical analyzes have been conducted to investigate the influence of using TiO₂-Al₂O₃/water hybrid nanofluid in various plate heat exchangers. The attained findings showed successful utilization of TiO₂-Al₂O₃/water nanofluid. Based on the obtained results increasing the number of plates in the heat exchanger caused to obtain more increment by using both types of nanofluids.

中文翻译：

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混合纳米流体在不同板数板式换热器中的综合利用

目的

在基液中使用悬浮纳米粒子被认为是增强传热和提高各种热交换器热效率的最有效方法之一。有不同类型的纳米流体可供使用，并用于不同的应用。本研究的主要目的是研究使用混合纳米流体和板片数量对板式换热器性能的影响。在本研究中，TiO ₂ /水单一纳米流体和TiO ₂ -Al ₂ O ₃ /水杂化纳米流体的1％颗粒重量比已被用于制备混合纳米流体，用于具有三种不同板数的板式换热器，包括8 、 12 和 16。

设计/方法/方法

进行实验的目的是检查板数和使用的纳米流体对传热增强的影响。性能测试是在 40°C、45°C、50°C 和 55°C 设定的出口温度下以及在 1,600 和 3,800 之间的五个不同雷诺数下进行的。此外，数值模拟已被应用于验证换热器内的热和流动行为。

发现

结果表明，使用两种纳米流体都提高了所有具有不同板数的测试换热器的热性能。虽然本研究的主要结果表明，与 TiO ₂ /水单一型纳米流体相比，TiO ₂ -Al ₂ O ₃ /水混合纳米流体具有优先权。TiO ₂ -Al ₂ O ₃ /水纳米流体的使用使8、12和16板换热器的传热分别平均提高了7.5%、9.6%和12.3%。

原创性/价值

在目前的工作中，已经进行了实验和数值分析来研究在各种板式换热器中使用 TiO ₂ -Al ₂ O ₃ /水混合纳米流体的影响。获得的结果表明成功利用了TiO ₂ -Al ₂ O ₃ /水纳米流体。基于获得的结果，通过使用两种类型的纳米流体，增加热交换器中的板片数量会导致获得更多的增量。