Thermo-Fluidic Analysis of Pulsating Heat Pipes Charged with Water-Based Immiscible Fluid Pairs

Abstract

Immiscible fluids may provide operational flexibility for pulsating heat pipes (PHPs) due to thermo-hydrodynamic diversity lead by each pure component. In this regard, present paper focuses on the thermo-fluidic analysis of non-uniform pulsating heat pipes charged with water-based immiscible fluid pairs. Research parameters cover gravity effect via the inclination angles (IA) of 0o and 90o, and fluid pair effect via two different water-based immiscible binary fluids as Water (W) – Hexane (H), and Water (W) – Pentane (P). The volumetric mixing ratios are W:H=1:1, 1:4, 4:1, 1:0, 0:1, and W:P=1:1, 1:4, 4:1, 1:0, 0:1; and the non-uniform flat plate type pulsating heat pipe (FP-CLPHP) has alternating-sequence parallel channels. The experiments are performed at the filling ratio of 40% (FR=40%), and flow phenomena is visualized. As some conclusions; at vertical orientation, the FP-CLPHPs having binary fluids of water-pentane show better thermal performance compared to the pure counterparts. Especially, the heat transfer characteristics of W:P=1:1 are the best ones among all the pure and binary fluids. On the other hand, as a conclusion of combination of non-uniform design and suitable thermophysical properties, the FP-CLPHPs charged with pure pentane, pure hexane or binary fluid of W:P=1:4 can work independent from gravitational force.

Keywords

• Immiscibility
• Pulsating heat pipe
• Fluid pairs
• Thermo-fluidic analysis

Su Bazlı Karışmayan Akışkan Çiftleriyle Yüklü Atımlı Isı Borularının Termo-Akış Analizi

Abstract

Birbiriyle karışmayan akışkanlar, her bir saf bileşenin sebep olabileceği termo-hidrodinamik farklılık nedeniyle, atımlı ısı boruları (PHP’ler) için çalışma esnekliği sağlar. Bu kapsamda, bu çalışma su bazlı karışmayan akışkan çiftleri ile yüklenmiş üniform olmayan atımlı ısı borularının termo-akışkan analizine odaklanmaktadır. Araştırma parametreleri; 0º ve 90º eğim açıları (IA) aracılığıyla yer çekimi etkisini ve su (W) – hekzan (H) ve su (W) – pentan (P) olmak üzere iki farklı su bazlı karışmayan ikili akışkanlar aracılığıyla akışkan çifti etkisini kapsamaktadır. Hacimsel karışım oranları; W:H=1:1, 1:4, 4:1, 1:0, 0:1 ve W:P=1:1, 1:4, 4:1, 1:0, 0:1’dir ve üniform olmayan düz plaka tipi atımlı ısı borusu (FP-CLPHP) alternatif sıralı paralel kanallara sahiptir. Deneyler %40 dolum oranında (FR=40%) yapılmıştır ve akış olayları görüntülenmiştir. Bazı sonuçlar şu şekildedir: düşey konumda, su-pentan ikili akışkanlarına sahip FP-CLPHP’ler, saf akışkanlı olanlara kıyasla daha iyi ısıl performans göstermiştir. Özellikle, W:P=1:1’in ısı transfer karakteristikleri bütün saf ve ikili akışkanlar arasında en iyidir. Diğer taraftan, üniform olmayan tasarım ve uygun termo-fiziksel özelliklerin birleşiminin bir sonucu olarak, saf pentan, saf hekzan veya W:P=1:4 ikili akışkanıyla yüklü FP-CLPHP’ler yer çekimi kuvvetinden bağımsız çalışabilir.

Keywords

• Karışmama
• Atımlı ısı borusu
• Akışkan çiftleri
• Termo-akış analizi

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