A Method for Improving Heat Transfer to a Cryogenic Fluid

Cowley, C. W.; Timson, W. J.; Sawdye, J. A.

doi:10.1007/978-1-4757-0531-7_47

Cited by 21 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cryogenics proved a powerful tool in the food industry providing low temperature applications. Many researchers have worked on cryogenic freezing of food products for better quality, longer shelf life, and high throughput production capacity from as early as second half of 20th century (Arafa & Chen, ; Cowley, Timson, & Sawdye, ; Hoeft, Bates, & Ahmed, ; Streeter & Spencer, ). Davidge () discussed technical and control systems methods to distribute LN 2 for economic feasibility of the processes while discussing the application of cryogenics in food industry.…”

Section: Potential Of Cryogenics In Spice Grindingmentioning

confidence: 99%

Cryogenic grinding for better aroma retention and improved quality of Indian spices and herbs: A review

Saxena

Barnwal

Balasubramanian

et al. 2018

J Food Process Engineering

View full text Add to dashboard Cite

Spices are very well‐known for their characteristic aroma and peculiar taste from ancient time. Grinding of spices is an old practice using different grinding equipment suited as per prevailing conditions. In modern era, the popularity of quality processed products has increased in spices. Cryogenics has very important role to play in food sector. Liquid nitrogen is the preferred among all available cryogens to obtain desired low temperature in food grinding. Grinding of spices at very low temperature produced superior quality ground powder with better hygiene. In spite of a proven technology it is not being popular in developing countries including India due to high initial investment. Present review article brings together the original work done to realize physico‐mechanical, thermal and grinding characteristics, aroma profile, and medicinally important compounds of selected spices for developing design of low cost cryo‐grinder specifically for spices and its possible commercial application. Practical applications Cryogenic grinding of spices and herbs not only retain the volatiles with no loss as well as maintain the originality in flavor quality, thus has prospective commercial uses. Enhancement of pharmacological properties opens another important avenue for utilization of this technology for herbal grinding in Ayurveda and other traditional system of medicine. Particle size up to 50 μm may be achieved by cryogenic grinding which in turn will be more effective in medicinal or therapeutic use. Less quantity of herbal drugs will be required if ground cryogenically.

show abstract

Section: Potential Of Cryogenics In Spice Grindingmentioning

confidence: 99%

Cryogenic grinding for better aroma retention and improved quality of Indian spices and herbs: A review

Saxena

Barnwal

Balasubramanian

et al. 2018

J Food Process Engineering

View full text Add to dashboard Cite

show abstract

“…Heat transfer rates during cooling in liquid nitrogen can be increased by applying thermally insulating films to the exterior surface of the container (Cowley et al 1961). By using a material such as polyvinylpyrrolidone (PVP) which is soluble both in volatile organic solvents and in water, an insulating film can be produced, which washes off and so does not interfere when the containers are thawed in a warm water bath.…”

Section: Equipmentmentioning

confidence: 99%

Long-Term Preservation of Blood

1964

Proceedings of the Royal Society of Medicine

View full text Add to dashboard Cite

“…This appropriately shifts the boiling process toward the transition zone or even the nucleate region, intensifying the heat transfer. At the same time, there is an optimal value of the thermal resistance of the thermal insulation at which a significant reduction in the cooling time of the body is achieved . Thus, according to Lavalle et al, a fourfold reduction in the cooling time of a copper ball with a diameter of 25.4 mm was achieved.…”

Section: Introductionmentioning

confidence: 99%

Modification of pool boiling regimes by sand deposition

et al. 2019

View full text Add to dashboard Cite

Sand spots, attached to a copper ball surface by means of polyvinyl acetate adhesive and distributed over the surface with areal density that ranges between one spot per 1.18 cm 2 (for low-density spots) and one spot per 0.51 cm 2 (for high-density spots), serve as a temporary heat transfer enhancer during the quenching in liquid nitrogen. Highest heat flux densities, achieved during quenching, lie in the range 10.8 to 20.2 W/cm 2 , depending on the sand layer structure.Application of the temporary enhancer increases an amount of heat, evacuated by highly effective nucleate and transition boiling, by factor of 4.5 as compared with the bare sample. The process of sand layer preparation, data acquisition peculiarities, relationship between heat exchange efficiency and the spots areal density, along with sand grit size are discussed in this paper. K E Y W O R D Sheat transfer enhancement, nucleate boiling, temporary enhancer

show abstract

A Method for Improving Heat Transfer to a Cryogenic Fluid

Cited by 21 publications

References 2 publications

Cryogenic grinding for better aroma retention and improved quality of Indian spices and herbs: A review

Cryogenic grinding for better aroma retention and improved quality of Indian spices and herbs: A review

Long-Term Preservation of Blood

Modification of pool boiling regimes by sand deposition

Contact Info

Product

Resources

About