GYROID YAPISININ GÖZENEKLİ ORTAM OLARAK AKIŞ VE ISI TRANSFER PERFORMANSININ İNCELENMESİ

Öz

Isı transferini iyileştirmek için aktif ve pasif yöntemler kullanılmaktadır. Pasif yöntemlerden biri yüksek ısı transfer yüzey alanına sahip gözenekli ortamlardır. Gözenekli ortamlar düzenli ve düzensiz yapılar olmak üzere iki gruba ayrılır. Düzenli yapılardan biri de son zamanlarda oldukça sık incelenen üç yönlü periyodik minimal yüzeylerdir (ÜYPMY). Bu çalışmada, literatürde en çok kullanılan ÜYPMY'lerden biri olan Gyroid geometrisinin ısı transferi ve akış analizi, eşlenik ısı transferi koşulları dikkate alınarak sayısal olarak incelenmiştir. Tek bir gözeneklilik dikkate alınmış (ε = 0,6) ve ısı değiştiricideki sıcaklık değişimini incelemek için ısı değiştirici malzemesi olarak alüminyum, seramik ve PLA seçilmiştir. Farklı akış koşullarını değerlendirebilmek için Reynolds sayıları (Reh) 19,12 - 95,61 ve 172,09 olarak kabul edilmiştir. Akışkan giriş sıcaklığının 298,15 K'da sabit olduğu, ısı değiştiricinin başlangıç sıcaklığının ise havalandırma standartlarındaki rejeneratif ısı geri kazanım sıcaklık farkıyla tutarlı olması için 278,15 K'de sabit olduğu varsayılmıştır. Farklı çalışma koşullarındaki Nu sayıları karşılaştırıldığında, düşük ısıl iletkenliğine rağmen düşük ısıl yayılımı en yüksek seviyede olan seramik malzemedir. En yüksek Re sayısında alüminyum eşanjöre göre yaklaşık %6 daha iyi ısı transferi sağlamıştır.

Anahtar Kelimeler

• Isı değiştirici
• ısı transferi
• TPMS
• Gyroid

INVESTIGATION OF FLOW AND HEAT TRANSFER PERFORMANCE OF GYROID STRUCTURE AS POROUS MEDIA

Öz

There are active and passive methods used to improve heat transfer. One of the passive methods is utilising porous media with high heat transfer surface area. Porous media are divided into two groups: regular and irregular structures. One of the regular structures is triply periodic minimal surfaces (TPMS), which have been studied quite frequently recently. In this study, heat transfer and flow analysis of a Gyroid geometry, one of the most used TPMS in the literature, is investigated numerically considering the conjugate heat transfer conditions. A single porosity is considered (ε = 0.6), and aluminium, ceramic and PLA are selected for the heat exchanger material to examine the temperature change in the heat exchanger. To understand the different flow characteristics, Reynolds numbers (Reh) are assumed to be 19.12, 95.61 and 172.09. The fluid inlet temperature is assumed to be constant at 298.15 K, and the initial temperature of the heat exchanger is assumed to be constant at 278.15 K to be consistent with the regenerative heat recovery temperature difference in ventilation standards. Nu numbers under different operating conditions are compared, and it is the ceramic material with low thermal diffusivity is at the highest level despite its low thermal conductivity. At the highest Re number, it provided approximately 6% better heat transfer than the aluminium heat exchanger.

Anahtar Kelimeler

• Heat exchanger
• heat transfer
• TPMS
• Gyroid

Kaynakça

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