Critical Radius of insulation in Heat Transfer

For the purpose of maximium heat transfer. Sometimes we added extra
surface area with heat transfered body ( i.e. insulation in case of
wire cable) so it can transfer maximium heat from the heated body to

But Here it should be noted that when we add the surface area for
increasing the heat flow. The conductive resistance of extra surface
area will also added to the body. And this will reduced the heat
transfer rate.

Hence there is two opposite and inversely phenomenon will happen this
will eliminates the advantage of surface area addition.

To reducing this problem it is necessory to examine radius of extra
surface area which can tranfer maximium heat. This radius of extra
surface called " CRITICAL RADIUS of INSULATION".

It can be found by differentiating the overall resistance equation
w.r. to outer radius of extra surface (i.e. By Maxima and Minima

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Job for Pre Final Engineering student (B.TECH 3rd year) in Indian Army

Indian Army – 23rd UES – Pre final year University Entry Scheme (60 Posts)
August 16th, 2012
Indian Army
(Ministry of Defence, Government of India)
Room No B-30 ADG PI South Block Integrated Headquarters of MoD (Army)
New delhi : 110011 Delhi,India .
23rd Pre Final Year University Entry Scheme – For Men Permanent
Commission – 2014 – 23rd UES
Applications are invited from UNMARRIED male Engineering Degree
students studying in Pre-Final Year ( III year ) in academic session
2012-13 f or Grant of Permanent Commission in the Army. Details are
as follows :
D etails of the Commission : Pre – Final Year (PFY) BE/ B.Tech (PFY)
candidates of Engineering branch/stream
No. of Posts : 60
Details of Vacancies in respect of Engineering branch/stream :
1. Civil (including Mining) – 12 Posts
2. Architecture/Building Constr Technology – 02 Posts
3. Electrical (including Electrical & Electronics) – 08Posts
4. Mech (incl Industrial/Industrial Engg &
Management/Automobile/Transportation Engg) – 10 Posts
5. Production (including Manufacturing/Metallurgical/Metallurgy &
explosives) – 03 Posts
6. Electronics (including Electronics & Instrumentation/Micro
Electronics & Microwave/Opto Electronics) – 07 Posts
7. Communication/Telecom(inclECE/Electronics & Tele communication/
Satellite Communication) – 11 Posts
8. Food Tech/Bio Tech/Bio Medical Engg – 02 Posts
9. Computer Science & Engg/Computer Technology/Computer Science/ MSc
Computer Science – 04 Posts
10. Chemical Engg – 01 Posts
Age Limit : Born between 02 Jul 89 and 01 Jul 95 - Not below 18 Yrs
and not over 24 Yrs
Educational Qualification: Candidates studying in the Pre – Final
ofthe Engineering Course in recognised Universities/
Institutions/Colleges in the subjects mentioned above will be
eligible to apply but must possess the educational qualification at
the time of joining training orproduce the proof of having obtained
the educational qualification within 12 weeks from the date of
commencement of training forthe grant of Permanent Commission in the
interview for the first time for a particular type of commission,
shall be entitled for AC III tier to and fro Railway fare or Bus fare
including reservation cum sleeper charges within the Indian limits.
Stipend During Training: During the period of training the candidates
will be given a stipend of Rs. 21,000/- p.m. (Rs. 15,600/- as pay in
Pay Band Plus Grade Pay Rs 5,400/-).
Pay Scale (After Training) : Rs.PB-3 – 15600-39100/- GP Rs.5400/- MSP
Rs.6000/- Approx. CTC Rs.65000/- PM.
Privileges : In addition to the CTC mentioned above, Army provides
free Medical Facilities for Self & dependents, Canteen facilities,
Entitled Ration, Mess/Club/Sports Facilities, Furnished Govt
Accommodation, Car/Housing Loan at subsidised rate.
How to Apply : Apply on plain paper (size 30 x 20 cms) as per (UES 23
Application Form) format, given the website : (b) The envelop (white) containing the
application should be SUPERSCRIBED IN RED INK indicating clearly
thebranch of Engineering applied for. For example ' APPLICATIONS
FOR 23 UES ENTRY ENGINEERING'. (c) Send your application so as to
reach respective Command HQ at the following address :

HQ Central Command (A Branch), Lucknow (UP) PIN-226002. - For student
studying in the states of Uttar Pradesh, Madhya Pradesh, Bihar,
Orissa, Uttarakhand, Jharkhand and Chhatisgarh.
Last Date : 28th September2012

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