Gian Luca MORINI, Marco LORENZINI

1612

Mikrokanallarda tek-fazlı akışkan akışı ve ısı geçişi

Son yıllarda mlkrokanallardaki tek-fazlı akışın akış-dinamikleri ve ısı geçişi karakteristikleri üzerine çok sayıda deneysel analiz yapılmıştır. Mlkrokanallardaki deneysel sonuçlar üzerine son yıllarda literatürde çeşitli çalışmalar yapılmıştır. Bu çalışmalar, bazen klasik bağıntılarla uyuşması bazen de onlarla ters düşmesi, nedeniyle sonuçların tek anlamlılıktan ne kadar uzak olduğunu açıkça göstermektedir. Bu makalede esas olarak bu sapmaların nedeni analiz edilecek ve tartışılacaktır. Bu deneysel çalışmaların kronolojik analizinden, mikrokanallardan elde edilen deneysel veri ile geleneksel teorinin öngörüleri arasındaki farklılığın azaldığını görmek mümkündür. Bu gerçek, mikrokanalın pürüzlülüğü ve geometrisinin daha iyi kontrolünün sonucu olan mikro üretim tekniklerindeki büyük gelişme ve yapılan deneysel testlerin doğruluğundakl artışla kısmen açıklanabilir. Bu nedenle, daha önce yapılan çalışmaların sonuçları bazen hatalarla dolu ve yanıltıcı olabilmektedir. Bu çalışmada, mlkrokanaliardaki tek-fazlı akışların ısı taşnımı ve basınç düşüşü üzerindeki ana ölçek ve mlkro-etkilerinin rolünün, klasik teoriyle kanıtlanabilen, literatürde yayınlanan pek çok deneysel sonuçla açıklanması hedeflenmektedir. Yazarlar, klasik akışkanlar dinamiği ve ısı geçişi kanunları hakkında İyi bilgiye sahip olmanın genelde pek çok şaşırtıcı ve beklenmeyen sonucun anlaşılması için yeterli olacağını düşünmektedir.

Single-phase fluid flow and heat transfer in microchannels

In the last years a large amount of experimental analyses have been addressed to the study of the fluid-dynamical and heat transfer characteristics of single-phase flows in microchannels: Reviews of experimental results, for mlcrochannels have appeared In the last years in the open literature, These reviews show clearly how the results are far from univocal, sometimes agreeing with the classical correlations, at other times contradicting them. In this paper the main aspects:which can be, responsible for these deviations will be analysed , and discussed. From a chronological analysis: of these experimental works it is possible, to note that the discrepancy between the experimental data obtained for microchannels and the predictions of the conventional theory is decreasing. This fact can be partially, explained by considering the, dramatic improvements in microfabrication techniques with the consequent more appropriate control,of the roughness and geometry of the microchannel and with the increase in the accuracy of the experimental tests made. For this reason the results of the older studies are sometimes fraught with errors and can be misleading. In this work the role played by the main scaling effects and micro-effects on the pressure drop and on the convective heat transfer for single-phase flows in microchannels will be analysed with the aim to explain that many experimental results published In the open literature can be justified by using the conventional theory. It Is opinion of the writers that a good knowledge of the classical laws of fluid-dynamics and heat transfer are in general: sufficient to understand a large amount of apparently baffling and unexpected results.
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Mühendis ve Makina-Cover
  • ISSN: 1300-3402
  • Yayın Aralığı: Yılda 4 Sayı
  • Başlangıç: 1957
  • Yayıncı: TMMOB MAKİNA MÜHENDİSLERİ ODASI
Arşiv
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