The Relationship Between Marine Propulsion Power and Heat Transfer with Constructal Law

Abstract

Constructal Law was introduced by Adrian Bejan to the literature in 1996 as a theory that explain the principles of design in nature and engineering. If there is no flow (movement) then the potential of a system to do work cannot be considered. One of the most important criteria to uncover solutions for flow systems is that these systems maintain their movement by using the path of the least resistance. A system that moves with the least resistance path for a certain period of time finds new paths (channels) for itself as time goes by or changes its direction by not using some possible paths. Constructal Law reveals the physics of these flow systems are in prime importance. This article provides a physical insight and analysis of flow systems that are at the core of many engineering problems (specifically installed main engine power and heat transfer) in accordance with Constructal Law. In addition, the relationship between DWT and installed main engine power for 1085 oil tankers was analyzed by nonlinear regression. As a result, the evolution of ships and heat transfer are compatible with Constructal Law.

Keywords

• Constructal law
• flow systems
• ships
• efficiency
• heat transfer

Gemi Sevk Gücü ve Isı Transferinin Yapısal Gelişim Teorisi ile İlişkisi

Öz

Yapısal Gelişim Teorisi 1996 yılında literatüre kazandırılmış olup tabiattaki ve mühendislikteki tasarım prensiplerini açıklar. Teori, yeryüzündeki akış sistemlerini bütüncül bir şekilde ele alır. Akışın (hareketin) olmadığı yerde çoğu zaman canlılıktan bahsetmemiz dahi mümkün olmamaktadır. Akış sistemlerinin çözümünde anahtar davranış biçimi bu sistemlerin minimum dirençli yol ile hareketini sürdürmesidir. Belli bir zaman dilimi için minimum direnç ile hareket eden sistem zaman geçtikçe kendine yeni yollar (kanallar) bulmakta ya da bazı yolları hiç kullanmayarak yönünü değiştirmektedir. Yapısal Gelişim Teorisi ise hayati öneme sahip olan akış sistemlerinin fiziksel arka planını ortaya koymaktadır. Bu makalede özellikle mühendislik çözümlerinin başında gelen akış sistemlerinin yapısı (gemilerde kurulu ana makine gücü ve ısı transferi örnekleri özelinde) ve Yapısal Gelişim Teorisi’ne göre ilişkisi araştırılmıştır. Bunun için 1085 adet petrol tankeri için DWT ile bu tankerler için gerekli olan güç ilişkisi nonlineer regresyon ile analiz edilmiştir. Sonuç olarak gemilerdeki genel gelişimin ve ısı transferinin yapısal gelişim prensiplerine uygun şekilde gerçekleştiği gösterilmiştir.

Anahtar Kelimeler

• Yapısal gelişim teorisi
• gemi
• verim
• akış sistemleri
• ısı transferi.

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