Alper YILMAZ, Orhan BÜYÜKALACA, Ahmet FERTELLİ

Ice formation around a horizontal tube in a rectangular vessel

Bu çalışmada soğu enerjisi depolamasında kullanılan yatay bir boru etrafındaki faz değişimi araştırılmıştır. Farklı ısı transfer akışkanı sıcaklıklarının buz oluşumuna etkisini incelemek için deneyler yapılmıştır. Test tankı içerisinde farklı noktalarda sıcaklıkların ölçülmesiyle, suyun aşırı soğuma sıcaklığı ve zamanı tespit edilmiştir. Deney süresince boru etrafındaki buz kalınlığı farklı eksenel pozisyonlarda ölçülmüş ve boru etrafındaki buz oluşumunu tespit edebilmek için bir matematik model oluşturulmuştur. Model basit bir model olmasına rağmen, deneysel sonuçlarla model sonuçlarının birbiri ile uyumlu olduğu görülmüştür.

Dikdörtgen bir tank içerisinde yatay bir boru etrafındaki buz oluşumu

This paper investigates phase change phenomena around a horizontal tube during a cooling process of thermal storage. Experiments are performed to investigate the effects of different heat transfer fluid inlet temperatures on ice formation around the tube. Supercooling temperature and the time for the start of nucleation of water are observed by measuring the time variations of temperature profiles at various locations inside the test vessel. The thickness of the ice formed around the tube was measured at different axial positions along the tube during the experiments. A mathematical model to predict ice formation around the tube is proposed. Comparison of the results of the model with that of the experiments showed that the agreement between the two is acceptable, although the model is simple.

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