... the last few decades, high-heat-flux removal still largely remains as a challenging subject that needs further exploration and study. In this paper, we have reviewed recent developments in several high-heat-flux heat removal techniques, including microchannels, jet impingements, sprays, wettability effects...

...Bahman Abbasi; Jungho Kim Spray cooling heat transfer measurements of PF-5060 on smooth flat surfaces were obtained using a microheater array operated at constant temperatures using two nozzles (hollow cone and full cone), three nozzle-to-heater standoff distances (3, 5, and 7 mm), four nozzle...

...Vaibhav Kumar Sahu; Vasudevan Raghavan; Daniel N. Pope; George Gogos A numerical study of steady burning of spherical ethanol particles in a spray environment is presented. A spray environment is modeled as a high temperature oxidizer stream where the major products of combustion such as carbon...

...Avijit Bhunia; C. L. Chen The necessity for an efficient thermal management system covering large areas is growing rapidly with the push toward more electric systems. A significant amount of research over the past 2 decades has conclusively proved the suitability of jet, droplet, or spray...

...Bahman Abbasi; Jungho Kim One of the main challenges of spray cooling technology is the prediction of local and average heat transfer coefficients on the heater surface. It is hypothesized that the local heat transfer coefficient can be predicted from the local normal pressure produced by the spray...

... as artificially modifying the boundaries) continues to be the fundamental basis for efforts to resolve many different issues in boiling, spray dynamics and coatings, and two-phase flow heat transfer. It is also clear that enhancement of heat transfer is and will be increasingly critical to both large and small...

..., spray cooling, and droplet-film coating, among many other engineering applications. Numerous studies have tried to characterize the interfacial behavior and model their mechanistic influences either directly or implicitly via parametric experimental investigations and/or simulations. The goal...

...Huseyin Bostanci; Daniel P. Rini; John P. Kizito; Louis C. Chow Experiments were performed to investigate spray cooling on microstructured surfaces. Surface modification techniques were utilized to obtain microscale indentations and protrusions on the heater surfaces. A smooth surface was also...

...A. R. Griffin; A. Vijayakumar; R.-H. Chen; K. B. Sundaram; L. C. Chow A heater designed to monitor surface temperature fluctuations during pool boiling and spray cooling experiments while the bubbles are simultaneously being observed has been fabricated and tested. The heat source was a transparent...

... to jets, to sprays. Through an experimental study, the impingement heat transfer was evaluated over a range of operating conditions and geometrical parameters with subcooled ethanol used as the working fluid. The ability to change the mode of impinging mass did change the surface heat transfer...

...John D. Bernardin; Issam Mudawar An experimental study was performed to characterize the transition boiling heat transfer rate from a surface to a stream of impinging water droplets and to extrapolate this information to predict the transition boiling heat transfer of a dilute spray. First...

...Johnathan S. Coursey; Jungho Kim; Kenneth T. Kiger Direct spraying of dielectric liquids has been shown to be an effective method of cooling high-power electronics. Recent studies have illustrated that even higher heat transfer can be obtained by adding extended structures, particularly straight...

...M. S. Balasubramanyam; C. P. Chen; H. P. Trinh A new approach to account for finite thermal conductivity and turbulence effects within atomizing droplets of an evaporating spray is presented in this paper. The model is an extension of the T-blob and T-TAB atomization/spray model of Trinh and Chen...

...G. G. Nasr; R. A. Sharief; A. J. Yule A novel technique is described for investigating spray cooling of moving hot surfaces. An experimental investigation is described for vertically downwards water sprays impinging on a horizontal steel annulus of 250 mm diameter with a surface temperature up...

...Achintya Mukhopadhyay; Dipankar Sanyal An algorithm for solution of a model for heating and evaporation of a fuel droplet has been developed. The objective of the work is to develop a computationally economic solution module for simulating droplet evaporation that can be incorporated in spray...

...Matteo Fabbri; Shanjuan Jiang; Vijay K. Dhir Direct cooling by means of jets and sprays has been considered as a solution to the problem of cooling of high power density electronic devices. Although both methods are capable of very high heat removal rates no criterion exists that helps one decide...

.... Their results indicate that enhanced surfaces augment heat transfer coefficients as well as CHF. The surface with microgrooves gave the best performance, yielding CHF values in excess of 160 W / cm 2 with a jet velocity of 2 m/s. Boiling spray cooling of chips has been investigated...

...Lanchao Lin; Rengasamy Ponnappan Tiny nozzles are developed that are capable of creating the swirling flow necessary to generate a full cone spray. Eight miniature nozzles are embedded in a multi-nozzle plate used to generate a spray array for the cooling of high heat flux laser diodes. The target...

...John D. Bernardin; Issam Mudawar This study presents, for impinging droplets and sprays, a model of the Leidenfrost point (LFP); the minimum liquid/solid interface temperature required to support film boiling on a smooth surface. The present model is an extension of a previously developed sessile...

...Qiang Cui; Sanjeev Chandra; Susan McCahan The effect of adding one of three salts (NaCl, Na 2 SO 4 or MgSO 4 ) to water sprayed on a hot surface was studied experimentally. A copper test surface was heated to 240°C and quenched with a water spray. The variation of surface temperature during cooling...