Micro Heat Exchanger Introduction
Hello participants, welcome back to the course heat exchanger fundamentals and design analysis. Today we are going to start a new topic micro heat exchangers. Micro heat exchangers is a very unique topic, it is a special kind of heat exchanger in the family of heat exchangers and in recent time there has been a lot of interest regarding micro heat exchangers, there is lot of developmental activities and as we can anticipate seeing the progress of the industry and technology that micro heat exchangers are going to be very important part of heat exchanger heat exchanger family and in in different domain of industry and engineering we will have future applications of micro bead extensions now what we will like to call herbartending to microwave exchanges would like to give some head over to the design of a micro heat exchangers manufacturing its application and particularly going to strangers I like to draw your attention towards the right hand side where I have taken a micro heat exchanger example of my cricket exchange from the literature of a particular manufacturing company uses from Tokyo this is a company based in Tokyo and this is basically a silent unity probably all of you you can identify that it is a silent heat exchanger and you see the small description what you can read what you will find that each of the tubes out of 2 mm diameter the thickness is .3 ml very think it’s not only the tubes are very small in diameter and thickness is also very thing they are made ofand you see here you have got one intersection so you have got an hour you can get an idea that how small is the passage so few passages mail and then if you go to discuss sectional view 1 in view it is not a cross-sectional view it is and if you so you can understand that between the two you whatever sale passage is there for the same food that is also very small changes then literally means that it is small small dimension but there are other differences are alsoprobably one can say that we have not contacted exteriors compact fidget spinners are very very common in the in the in the industrial practice for ears to visit this completed projects are being used new designs of competitive changes are being proposed so what is the difference between competitive and Michael Peterson case we have to we have to understand that micro heat exchangers are a class different classes lot of overlap between the micro heat exchanger and competitive seriously impacted it’s also we will have very small passages because the surface area has to be large compared to the total volume of the ticket exchange smallinstructional similarities between these two but there are other differences which will be here as we proceed try to see what are the other features he got similar similaritiesand non-metallic materials for fabrication are not uncommon Mini micro you will find that whenever that will be manufactured or fabricated with non metallic material non-metallic materials are which are commonly used for the 5th edition of micro heat exchangers our class because many of these micro heat exchanger school be used at laboratory-scale or for a very sophisticated device it could be silicon it could be ceramic so this kind of non-metallic materials are used in the manufacturing of your micro heat exchangers in passages of non circular cross-section as we have to bake small bath dimensions will be very small many many times but not before we cannot have my schedule changesthis is one of the important feature of microscope heat exchangers are as small as possible so we have to use and then what is thatNepali small really a single passengers used that means nearly there will be only one person concerning I mean constituting the heat exchanger like in double pipe heat exchanger for each of the fluid we are having only one at this kind of designs are not common interest of my creative change it to the Arriva number of passengers if we choose number of this is there should be properly designed so that the food is distributed in the desired macmanor to all the passages to inner design illustrator and InDesign diesel features which are very unique to micro heat exchangers and we will come to this point later on that many cases we have to take care otherwise their meaning from a distribution necessity for unique methods of analysis business is known ascoming late just wanna to coming late just leaving this place in the passages send me know if they are really microchannel quote-unquote microchannel which we are going to define that how we will understand that their microchannel what happens the physics of hydrodynamics the floor physics that changes the questions we have used to do the questions does method of analysis is modified so that is one point and another thing as the configuration of design of the heat exchangers are not as the common or conventional latest Indian we will find that we have to add all different type of analysis which you will stress upon obviously because we have to have some basic idea regarding micro heat exchangers application of microwave stainlesscomponent cooling is a great impetus for improving technology improve the design in very high and then the proper functioning of the electronic components and then we have to have some micro it is obviouslyhelp my career many microreactors microreactor we need to have I mean when we may have this mic located stainless microwave and air conditioning system this is also have various applications refrigeration and air conditioning system that from the very beginning it’s a very demanding gives a very unique support place is very unique and it’s only when micro refrigeration and air-conditioning systems are there for that need one need to have micro heat exchangers Micra fuel since this need not be related to much energy crisis and particularly the search for clean energy that has made herself very important technology and micro fuel-cell to need to this market exchanges in medical devicesmicro auto electromechanical systems and humidity that is microscope devices so in all these places some examples I have given but there are many or in all these places we need to have micro heat exchangers like micro-endoscope show where there will be light source there will be other electronics and probably between will be needed and micro heat exchanger becomes a part and parcel of this kind of a device now I have given a background that basically what is micro heat exchangers we have only partial idea as we proceed by here and then we have given their application to impress upon that their importance should now let us go to microscope to it flow and heat transfer so basically when we try to design or analyse heat exchanger thermal or carbohydrate analysis is very importantplay modes of heat transfer conduction convection and radiation and heat transfer its first phase change all these can be present in microscope and electron microscope they will have some kind of a difference as what we see regarding these modes of heat transfer in macroscale all in conventional devices conduction in a very very thin layer is different from conduction through the bulk of ita nation with a small inclusive may have I mean may have to be considered differently compared to radiation in normal scale and same is true for connectivity as most of the heat exchanger concerned with convective heat transfer we cannot discuss microbrewery transfer to a very close to convict if it transfers on my grocery hi Rab Hai but many of the devices operate 800 number her transition from lavender explain like to spend some time and Rick Ross we are considering it is not the flow of gas only a gas or liquid or gas leaks define that this man is floor in dimension in small dimension is different from its counterpart in lunchtime instead so takes place to distribute depending on the operatingwhat one can find in a large dimension channel channel of a large cross-section we will find the difference I know Florida mall Johannesburg an exampleand the glass face when trying to occupy the top part of the Android on point configuration are we getting the effect of the confinement a very small channel flowCPAP machine of the body do that when is the snow condition and we'd like to move it this Mike if we consider this particular maintenance number that means not some point but it is it is less than .42 then we will typically floor is called sleep in that case let me happen we can divide people into poo and pee while they're asleep and temperature jam but in the body is your similar to getwhat is BT BT is Baldwin transportation and dsmc is direct simulation Monte Carlo method to by this we have to analyse the flow situation. Now whatever I have told, it needs a little bit of explanation, we will go for this explanation in our next class so I like end here and thank you for your attention.