Author
Gunol Kojasoy
Other affiliations: University of Wisconsin-Madison
Bio: Gunol Kojasoy is an academic researcher from University of Wisconsin–Milwaukee. The author has contributed to research in topics: Pressure drop & Two-phase flow. The author has an hindex of 9, co-authored 13 publications receiving 290 citations. Previous affiliations of Gunol Kojasoy include University of Wisconsin-Madison.
Papers
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TL;DR: In this article, the internal phase distribution of concurrent, air-water bubbly flow in a 50.3mm i.d. transparent horizontal pipeline has been experimentally investigated using the hot-film anemometry technique.
47 citations
TL;DR: In this paper, the geometric effects of flow obstruction on the distribution of local two-phase flow parameters and their transport characteristics in horizontal bubbly flow were investigated and the effect of elbow was found to be evident in both the distribution and their development.
46 citations
TL;DR: In this paper, the authors used forced convective boiling in a cold-plate containing multiple miniature heat exchangers to develop heat transfer and pressure drop correlations valid for the flow conditions expected in miniature coldplate technology, experiments were conducted with R-134a as a working fluid.
43 citations
TL;DR: In this article, two-phase flow pressure changes through singularities such as sudden expansion and sudden contraction of thick and thin-orifice plates were modeled based on the reversible and irreversible losses through contractions and expansions.
40 citations
TL;DR: The axial liquid-phase velocity profile development in a horizontal air-water plug/slug flow pattern was experimentally investigated by simultaneously using two hot-film anemometers.
38 citations
Cited by
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TL;DR: In this paper, a literature review on heat transfer and flow characteristics of single-phase and two-phase flow in curved tubes is presented, where three main categories of curved tubes; helically coiled tubes, spirally coiling tubes, and other coiled tube, are described.
Abstract: The performance of heat exchangers can be improved to perform a certain heat-transfer duty by heat transfer enhancement techniques. In general, these techniques can be divided into two groups: active and passive techniques. The active techniques require external forces, e.g. electric field, acoustic or surface vibration, etc. The passive techniques require fluid additives or special surface geometries. Curved tubes have been used as one of the passive heat transfer enhancement techniques and are the most widely used tubes in several heat transfer applications. This article provides a literature review on heat transfer and flow characteristics of single-phase and two-phase flow in curved tubes. Three main categories of curved tubes; helically coiled tubes, spirally coiled tubes, and other coiled tubes, are described. A review of published relevant correlations of single-phase heat transfer coefficients and single-phase, two-phase friction factors are presented.
441 citations
TL;DR: The main features of the problems addressed with GAs including the modeling, number of variables, and GA settings are presented, useful for future use of GAs in heat transfer.
378 citations
TL;DR: In this paper, the development of microprocessing technology and present a project being carried out to develop combined two-phase heat transfer and heat pipe technology with forced air convection and liquid condenser systems.
277 citations
01 Oct 2007
TL;DR: In this paper, a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems is provided, providing a comprehensive review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid 2-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-
Abstract: Providing a comprehensive introduction to the fundamentals and applications of flow and heat transfer in conventional and miniature systems, this fully enhanced and updated edition covers all the topics essential for graduate courses on two-phase flow, boiling, and condensation. Beginning with a concise review of single-phase flow fundamentals and interfacial phenomena, detailed and clear discussion is provided on a range of topics, including two-phase hydrodynamics and flow regimes, mathematical modeling of gas-liquid two-phase flows, pool and flow boiling, flow and boiling in mini and microchannels, external and internal-flow condensation with and without noncondensables, condensation in small flow passages, and two-phase choked flow. Numerous solved examples and end-of-chapter problems that include many common design problems likely to be encountered by students, make this an essential text for graduate students. With up-to-date detail on the most recent research trends and practical applications, it is also an ideal reference for professionals and researchers in mechanical, nuclear, and chemical engineering.
270 citations
TL;DR: In this paper, the effects of channel dimensions, channel wall thickness, bottom thickness and inlet velocity on the pressure drop, thermal resistance and the maximum allowable heat flux are presented.
247 citations