Exprimental Study on Effects of a Single Porous-Type Roughness Element in a Parallel-Plate Duct

Ichimiya, Koichi; Katayama, Masaki; Miyazawa, Toshiyoshi; Kondoh, Hiroshi

doi:10.1080/08916159108946424

Cited by 14 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To solve the second problem, there have been several experimental investigations, which focused on eliminating or alleviating the LHTAs in the rear corners of attached solid ribs. Ichimiya et al [7] experimentally investigated a single porous rib in a parallel plate duct. Yamada and Osaka [8] studied the effects of the aspect ratio and the open-area ratio of a porous plate on the heat transfer characteristics.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels

Liu

Wang

2011

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels

Liu

Wang

2011

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

“…Similarly, the studies investigated on porous rib type roughness show better heat transfer enhancement over smooth wall duct. 112 Pentagonal ribs as compared with the square ribs reported lower pressure drop and high heat transfer in the downstream position of the ribs, avoiding the creation of local hot spots just behind the rib. 98 Table 13 presents the details of performance enhancement techniques in terms of artificial roughness, range of temperature and pressure drop, and optimum flow, and operating geometrical parameters.…”

Section: Porosity Of Bed = 96%mentioning

confidence: 96%

“…Artificial roughness of various forms and geometrical shapes investigated by different researchers is reported in the literature. The use of rib roughness in numerous shapes and geometries, such as square, 88,90,[103][104][105] triangular, 92,95,106,107 rectangular, 106,107 inclined, 93 V-shaped, 89,108 W-shaped, 94 discrete, 93,94,109 chamfered, 88 wedge shaped, 107 arc shaped, 97,106,110,111 L shaped, 96 U shaped, 91 porous rib type roughness, 112 and pentagonal ribs 98 result a better performance compared to conventional-type solar air collector. Many of the investigators reported considerable enhancement in heat transfer with less penalty of friction by the application of…”

Section: Ribs and Groovesmentioning

confidence: 99%

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Chamarthi

Singh

2020

Intl J of Energy Research

View full text Add to dashboard Cite

This review composition aimed to comprehensively present the experimental investigation procedures and thermal performance augmentation techniques of solar air heaters. Various testing standards such as static and dynamic tests, and performance parameters, such as, thermal, thermo-hydraulic, and exergy efficiencies, are incorporated to present the experimental investigation procedures. The present review work deals with testing conditions (indoor and outdoor), instrumentation, various parameters of interest with corresponding optimum values, their uncertainty levels together with SAH orientation, air flow type, thermal energy storage devices, duct modifications and heat transfer surfaces using fins, baffles, and ribs employed to enhance the thermal performance. The authors of this review work believed that the current composition constitutes a summary of details to quickly access the information for analyzing the various experimental investigation procedures and heat transfer augmentation techniques along with the optimum values of flow and geometric parameters. Moreover, economical and efficient solar air-heating systems with low pressure drop and high heat exchange to air are presented and reviewed.

show abstract

“…Further inclined separate ribs resulted in 10% to 20% surge in heat transfer. Ichimiya et al [10] used spongy type roughness on absorber plate and concluded that this type of roughness delivered greater thermal enactment as compared to the solid rib type roughness. Han and Zhang [11] used parallel and V-shaped staggered discrete ribs on absorber plate and concluded these discrete ribs at an angle of 60° resulted in surge in heat transfer.…”

Section: B Literature Reviewmentioning

confidence: 99%

Evaluation of Solar Air Heater with Different Roughness Design

Islam¹

2021

IJRASET

View full text Add to dashboard Cite

Since that the future of our planet is intricately entwined with the future choices of the energy, effective exploitation of non-conventional energy sources is becoming increasingly essential for modern world as fossil fuels are hazardous to environment and cannot sustain supply for long time as they are not renewable. Moreover, demand of energy is increasing rapidly. In this scenario, solar energy is being seen as potential viable resource for ever increasing hunger of the energy for the development of nation and by and large globe. In this seminar work, effort has been made to demonstrate this reality with proof of statistics from reliable sources. Furthermore, numerous new designs of Solar Air Heater are emerging in various aspects, in different number of roughness, in different cost. Extensive review of research done in this field in recent past is covered with their design characteristics and their suitability for specific conditions and applications with respect to their merits and demerits. We concluded from our study that the increase in parameters like flow rate and roughness height up to some desirable values lead to increase in the efficiency of SAH. In present case plate 3 with roughness height of 8mm and flow rate of 0.05kg/s showed the maximum efficiency of 51.6%. I. INTRODUCTION A. EnergyEnergy is the prime requirement of any system. It serves as backbone to the modern world economic as well as domestic sector. Whether simple or complicated every system requires some form of energy input. With increased urbanization, modernization and particularly industrialization has led to the tremendous consumption of energy particularly exhaustible sources of energy. There are mainly two types of energy sources available that include; 1) Nonrenewable sources 2) Renewable sources The non-renewable energy sources also called as conventional energy sources are exhaustible which include coal, petroleum, natural gas, etc. These sources once used can't be then reused or recycled, making these energy sources vulnerable to extinction. Hence one can't use such sources limitlessly without giving any due consideration to their availability. Further it has been predicted that these sources may last up to 75-100 years from now on, so alternative to such conventional sources of energy must be tracked. And one such alternative is the renewable sources of energy. The renewable energy sources also known as non-conventional sources are inexhaustible and are replenished naturally, these include solar energy, and hydroelectricity, wind energy, and biomass energy geo thermal energy etc. Around 30 nations have utilized these sources of energy to meet 20% of their energy requirements. To meet the growing energy demand high end researches are being carried out to utilize renewable energy sources more efficiently and to their fullest. Besides being readily available these resources are environment friendly i.e., these are least hazardous to both living and non-living creation. As an example, burning of coal produces lot of environment...

show abstract

Exprimental Study on Effects of a Single Porous-Type Roughness Element in a Parallel-Plate Duct

Cited by 14 publications

References 8 publications

Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels

Numerical investigation on synthetical performances of fluid flow and heat transfer of semiattached rib-channels

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Evaluation of Solar Air Heater with Different Roughness Design

Contact Info

Product

Resources

About